1.

Consider the data set.

2,5,7,8,9

(a)

Find the range. (Enter an exact number.)

(b)

Use the defining formula to compute the sample standard deviations. (Enter a number. Round your answer to two decimal places.)

(c)

Use the defining formula to compute the population standard deviation. (Enter a number. Round your answer to two decimal places.)

2.

Sketch the area under the standard normal curve over the indicated interval and find the specified area. (Enter a number. Round your answer to four decimal places.)

The area to the left ofz=0.53is