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There are 39 students in a psychology class. The class has been divided into 10 groups; 9 groups have 4 students in them, 1 group only has 3 students. The instructor puts all of the students names in a hat and then randomly draws 1 name. What are the chances that the one name will be the name of someone in the small, 3-person group?
General
3 months ago
Sketch the domain D bounded by y = x^2, y = (1/2)x^2, and y=6x. Use a change of variables with the map x = uv, y = u^2 (for u ? 0) to calculate Double integral Dy^ - 1dx dy. This is an improper integral since f(x, y) = y^ - 1 is undefined at (0, 0), but it becomes proper after changing variables.
General
3 months ago
A quality inspector must verify whether a machine that packages snack foods is working correctly. The inspector will randomly select a sample of packages and weigh the amount of snack food in each. Assume that the weights of food in packages filled by this machine have a standard deviation of 0.30 ounce. An estimate of the mean amount of snack food in each package must be reported with 99.6% confidence and a margin of error of no more than 0.12 ounces. What would be the minimum sample size for the number of packages the inspector must select?
General
3 months ago
WILL MARK BRAINLIEST AND 20 POINTS!!Which linear function has the steepest slope?y= -8x+5y-9= -2(x+1)y=7x -3y+2=6(x+10)
General
3 months ago
Which of the following is a rate? 24 apples for $3 12 apples for $1.50 8 apples for $1 16 apples for $2
General
3 months ago
The amount of energy it takes to lift a box might be a function of which of thefollowing?
General
3 months ago
According to a study conducted by an organization, the proportion of Americans who were afraid to fly in 2006 was 0.10. A random sample of 1,300 Americans results in 143 indicating that they are afraid to fly. Explain why this is not necessarily evidence that the proportion of Americans who are afraid to fly has increased. Select the correct choice below and. if necessary, fill in the answer box to complete your choice. This is not necessarily evidence that the proportion of Americans who are afraid to fly has increased above 0.10 because the probability of obtaining a value equal to or more extreme than the sample proportion is . which is not unusual.
General
3 months ago
Suppose you have a sample of size 42 with a mean of 30 and a population standard deviation of 7.4. What is the maximal margin of error associated with a 95% confidence interval for the true population mean? As in the reading, in your calculations, use z = 2. Give your answer as a decimal, to two places
General
3 months ago
Emergency 911 calls to a small municipality in Idaho come in at the rate of one every two minutes. Assume that the number of 911 calls is a random variable that can be described by the Poisson distribution. (a) What is the expected number of 911 calls in one hour? per hour (b) What is the probability of three 911 calls in five minutes? If required, round your answer to four decimal places. (c) What is the probability of no 911 calls during a five-minute period? If required, round your answer to four decimal places.
General
3 months ago
An article states that false-positives in polygraph tests (tests in which an individual fails even though he or she is telling the truth) are relatively common and occur about 10% of the time. Suppose that such a test is given to 10 trustworthy individuals. (Round all answers to four decimal places.) What is the probability that all 10 pass?
General
3 months ago
The number of a certain company's video stores can be approximated by the linear equation y= -264x+4682, where x is the number of years after 1990. Find the missing coordinate for the ordered pair solution (7,?) -What's the y-interpret and x-interpret?
General
3 months ago
I made a distribution of 15 apartment rents in my neighborhood. One apartment had a higher rent than all the others, and this outlier caused the mean rent to be higher than the median rent. Does this make sense because the outlier with a large value increases the mean, but does not affect the median?
General
3 months ago
The inverse notation f -1 used in a pure mathematics problem is not always used when finding inverses of applied problems. Rather, the inverse of a function such as C = C(q) will be q = q(C). The following problem illustrates this idea. The ideal body weight w for men (in kilograms) as a function of height h (in inches) is given by the following function. W(h) = 49 + 2.2(h- 60) What is the ideal weight of a 6-foot male? The ideal weight, W, of a 6-foot male is kilograms. (Round to the nearest tenth as needed.) Express the height h as a function of weight W. Verify your answer by checking that W(h(W)) = W and h(W(h))h.
General
3 months ago
A2 = [1 2 3; 4 5 6; 7 8 9; 3 2 4; 6 5 4; 9 8 7]b2 = [1 1 1 1 1 1]′ (a) Find a basis for the row space of A2. (b) How many solutions does A2 ?
General
3 months ago
A random sample of size n1 = 16 is selected from a normal population with a mean of 75 and standard deviation of 8. A second random sample of size n2 = 9 is taken independently from another normal population with mean 70 and standard deviation of 12. Let X1 and X2 be the two sample means. Find(a) The probability that X1 − X2 exceeds 4.(b) The probability that 3.5 < X1 − X2 < 5.5.
General
3 months ago
If DM=35, what is the value of r ?
General
3 months ago
to find the product 3 3/8 * 4 1/9.tara rewrote 3 3/8 as 17/8 amd 4 1/9 as 13/9. she multiplies the fractions to find the product 221/72. what error did she make
General
3 months ago
9. A judge hears the following arguments in a murder hearing. The DNA test that places the accused at the murder scene has a true positive rate of 90% (i.e. the probability that the test returning positive given that the accused was actually present at the scene is 0.9). Similarly, the DNA test has a false negative rate of 80% (i.e. the probability that the test returns negative given that the accused was not present at the scene is 0.8). Everyone in the town has a equal probability of being at the murder scene, and the town has a population of 10,000. Given the fact that the DNA test returned a positive result for the accused, what is the probability that the accused was at the murder scene?
General
3 months ago
Darius wrote the number 84,273. Then he wrote a different number in which the digit 2 has 10 times the value it has in the number 84,273. Which could be the other number Jackson wrote? A 78,325 B 62,541 C 34,482 D 25,847
General
3 months ago
The probability distribution for damage claims paid by the Newton Automobile Insurance Company on collision insurance follows. Payment ($) Probability 0 0.85 500 0.04 1,000 0.04 3,000 0.03 5,000 0.02 8,000 0.01 10,000 0.01 (a) Use the expected collision payment to determine the collision insurance premium that would enable the company to break even. If required, round your answers to two decimal places. If your answer is zero, enter "0". x f(x) xf(x) 0 500 1000 3000 5000 8000 10000 Total (b) The insurance company charges an annual rate of $520 for the collision coverage. What is the expected value of the collision policy for a policyholder? (Hint: It is the expected payments from the company minus the cost of coverage.) If required, enter negative value as negative number. $ Why does the policyholder purchase a collision policy with this expected value? The input in the box below will not be graded, but may be reviewed and considered by your instructor.
General
3 months ago
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