\fQUESTION 7 Find the 90th percentile given a mean of 63 and a standard deviation of 5. A 78.2 O B. 86.3 C. 69.4 O D. 79.4 QUESTION 8 Suppose that the average number of hours a personal computer is used for entertainment is 2 hours per day. Assume the times for entertainment are normally distributed and the standard deviation for the times is 0.5 hour. Find the probability that a personal computer is used for entertainment between 1.8 and 2.75 hours per day. A. 0.7122 B. 0 6998 C. 0.5886 D. 0.3425 QUESTION 9 Suppose that the average number of hours a personal computer is used for entertainment is 2 hours per day. Assume the times for entertainment are normally distributed and the standard deviation for the times is 0.5 hour. Find the 25 percentiles. A. 1.96 B. 1 54 C 1.66 OD 2.12 Click Save and Submit to save and submit. Click Save All Answers to save all answers. Save WE x ] A DELLQUESTION 4 A. 0 6998 Find the probability for a student scoring less than 65 out of 100, with a mean of 63 and a standard deviation of 5. B. 0.6554 C. 0 5987 D. 0 4568 QUESTION 5 Find the probability that a randomly selected student scored more than 75 with a mean of 73 and a standard deviation of 5. O A. 0 2334 DB. 0 6778 C 0 4556 D 0 3445 QUESTION 6 Find the z-score for x = 75 with a mean of 73 and a standard deviation o A. z - 0.4 OB. Z = 1 C Z - -0.5 D. Z = 0.6 QUESTION 7 ad Submit to save and submit. Click Save All Answers to say Save Al An EM P 3 1x AB BELL