United Way contributions at a local college last year averaged $320 per person for 425 employees.The chair for this year's campaign hopes to increase the contributions per person by at least 15%.A sample of 25 employees taken following the advertising campaign showed an average contribution of $372 per person with a standard deviation of $18 per person.Test the null hypothesis at the 95% confidence level to determine if the campaign was successful.

Question 10 Find the mean and standard Deviation for the following data: Class Interval frequency 4-5 P 6- 7 8 -9 10 - 11 12 - 13 N - W N (Round your answers to two decimal places)