Q1, In a right-skewed distribution?

a,the median equals the mean.

b,the median is less than the mean.

c,the median is larger than the mean.

d,none of the above.

Q2, You want to check if the required sample size your accountant used is big enough. Calculate the required sample size for a 99% confidence interval if the standard deviation is 4 and the allowed error is 3? Round to a whole number.

Q3, You find the probability of clients ordering your new web social media app follows a normal distribution. If your sample is 36, the mean is 99, and the standard deviation is 20, what is the probability of more than 103 clients ordering your app ?

Q4, You interview a sample of 100 employees who have left the company. You want to estimate, with a 99% confidence level, the mean number of months worked before employees leave for competitors. Use a mean of 55 months and the standard deviation of 5 months. Provide the upper confidence interval.

Q5, You find the probability of clients ordering your new web social media app follows a normal distribution. If the order mean is 70 and the standard deviation is 20, what is the probability less than 64 customers will order your new app?