A sample of 25 undergraduates reported the following dollar amounts of entertainment expenses last year: 769 691 699 730 711 765 702 718 719 712 768 688 757 695 768 735 709 758 708 693 736 700 687 772 715

Required:
a. What are the range and standard deviation?
b. Use the Empirical Rule to establish an interval which includes about 95 percent of the observations.

Step-by-step explanation:

Given

The data for 25 undergraduates

Solving (a): Range and Standard deviation

The range is:

From the dataset:

So:

The standard deviation is:

First, calculate the mean

So, the standard deviation is:

Solving (b): The interval of the 95% of the observation.

Using the emperical rule, we have:

1,150 give brainliest

step-by-step explanation

2r= 2300

r =1150