1. Using the following array, conduct a frequency distribution using grouped frequencies.

Comment on the number of classes and width of class chosen. Show relative and cumulative frequencies, draw a histogram and discuss the shape of distribution.

5              10

6              14

7              12

10           8

  • 18
  1. Using the data below, compute the mean, medium, and mode. Which measures of central tendency are most appropriate to discuss the central tendency of this data?

4,5,7,7,7,10,12,14,14,20

  1. Using the Data below, calculate the standard deviation of the distribution. Draw the distribution and show the mean and the points at the first deviation both positive and negative.

3,5,7,10,12,15,18

  1. A normal population has a mean of 25 and a standard deviation of 5. Compute the z value associated with 20.

Commute the z value associated with 30

What proportions of the population is between 20 and 30?

  1. The mean of a normal probability distribution is 200 pounds. The standard deviation is 10 pounds.

Compute the z score at 215 pounds

What proportions is between 200 and 215 pounds?

What proportions falls above 215 pounds?

  1. A normal distribution has a mean of 100 and a standard deviation of 10. Determine the value above which 80% of the value will occur?