Suppose the mean height in inches of all 9th grade students at one high school is estimated. The population standard deviation is 5 inches. The heights of 10 randomly selected students are 67, 68, 75, 70, 70, 65, 65, 61, 71 and 72.

x=

Margin of error at 90% confidence level =

90% confidence interval =

[smaller value, larger value]