Normal distrubution mean 674 Standard deviation 76 Below the

Normal distrubution mean: 67.4

Standard deviation: 7.6

Below the top 85% and above the bottom 7%

Solution

Normal distribution mean: 67.4

Standard deviation: 7.6

Below the top 85% and above the bottom 7%

Z value for top 85% =1.036

X value of top 85% = 67.4+1.036*7.6 = 75.2736

Z value for bottom 7% = -1.476

X value of bottom 7% = 67.4 - 1.476*7.6 = 56.1824