The time to complete a math test is normally distributed with mean 48 minutes and standard deviation 1 minutes. a. What percentage of students completes the test in 45 minutes? b. What percentage of students completes the test between 30 and 55 minutes? с. Five percent of students who took the longest to complete the test were asked to go to the tutoring center. Within what time a student must finish the test in order to avoid going to the tutoring center?

7.2.29-T Question Help An IQ test is designed so that the mean is 100 and the standard deviation is 19 for the population of normal adults. Find the sample size necessary to estimate the mean IQ score of statistics students such that it can be said with 99% confidence that the sample mean is within 6 IQ points of the true mean. Assume that o = 19 and determine the required sample size using technology. Then determine if this is a reasonable sample size for a real world calculation. The required sample size is. (Round up to the nearest integer.)

According to a website, the mean number of apps on a smartphone in the United States is 85.  Assume the number of apps is normally distributed with mean 85 and standard deviation 23. What proportion of phones have fewer than 99 apps? Round the answer to four decimal places. The proportion of phones that have fewer than 99 apps is .

D) How to determine the maximum number of cloudy days that would be considered usual for June?