Consider the given data set.

n = 7

measurements: 7, 8, 4, 3, 7, 11, 5

Calculate the median.

Calculate the upper quartile.

Calculate the lower quartile.

2.

A distribution of measurements has a mean of 65 and a standard deviation of 7. You know nothing else about the size or shape of the data. Use this information to find the proportion of measurements in the given interval. (Round your answer to two decimal places.)

between 44 and 86

3.

A distribution of measurements is relatively mound-shaped with a mean of 60 and a standard deviation of 14. Use this information to find the proportion of measurements in the given interval.

between 46 and 74

4.

In a psychology experiment, 10 subjects were given 5 minutes to complete a task. Their time on task (in seconds) is given below.

170	185	255	225	245
195	190	195	220	260

Find the range.

Find the sample variance. (Round your answer to four decimal places.)

Find the sample standard deviation. (Round your answer to three decimal places.)