Consider the following relative frequency distribution:

a. Suppose this relative frequency distribution is based on a sample of 50 observations. Construct the frequency distribution. How many of the observations are at least −10 but less than 0?

b. Construct the cumulative frequency distribution. How many of the observations are less than 20?

c. Graph the relative frequency polygon.

Transcribed Image Text:

Relative Frequency Class -20 up to –10 0.04 -10 up to 0 0.28 O up to 10 0.26 10 up to 20 0.22 20 up to 30 0.20