Assuming that shoppers enter the store through the two doors independently, what is σT, the standard deviation of T?1389sqrt(13), or the square root of 13sqrt(89), or the square root of 89

A big department store has two entrance doors, one on 5th Ave. and the other on 6th Ave. The number of shoppers who enter the store through the 5th Ave. door in an hour, X, has mean of μX = 25 and standard deviation σX = 5, and the number of shoppers who enter the store through the 6th Ave. door in an hour, Y, has a mean of μY = 35, and standard deviation of σY = 8. Let the random variable T be the total number of shoppers who enter the store in an hour.What is μT, the mean of T?30421060Assuming that shoppers enter the store through the two doors independently, what is σT, the standard deviation of T?1389sqrt(13), or the square root of 13sqrt(89), or the square root of 89

The distribution of hourly sales for a local family owned store is normally distributed with a mean of $225 per hour and a standard deviation of $75 per hour. Which of the following intervals contains the middle 95% of hourly sales

The following data are the distances between 20 retail stores and a large distribution center. The distances are in miles.29; 30; 39; 40; 58; 67; 68; 69; 76; 83; 84; 95; 96; 96; 99; 106; 112; 127; 145; 150Use a graphing calculator or computer to find the standard deviation and round to the nearest tenth.

For a certain online store, the distribution of number of purchases per hour is approximately normal with mean 1,200 purchases and standard deviation 200 purchases. For what proportion of hours will the number of purchases at the online store exceed 1,400? 68% B 32% 16% 5% E 2.5%

29.The standard deviation of the sample means is equal to which of the following?  A. population standard deviation divided by the square root of n (sample size)  B. sample standard deviation divided by n (sample size)  C. sample standard deviation divided by the square root of n (sample size)  D. population standard deviation divided by n (sample size)