Given that z20 = –2 and z50= – 1, which of the following do you know?1.) The variance is 10.2.) The standard deviation is 30.3.) The mean is 80.4.) The median is 40.5.) The data point x=20 is 2 standard deviations form the mean6.) The data point x=50 is 1 standard deviation from the mean7.) The data point x=45 has a z-valued of 1.5