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 mean 6.) the data point x=50 is 1 standard deviation from the mean 7.) the data point x=45 has a z-valued of 1.5

What’s the numerical coefficient of 6xy

Which of the following is an example of a rational number? a. π b. √ 9 c. √ 8 d. 3.8362319

According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.