ABSTRACT
Practice Exercise 233 Testing for a normal distribution (Answers on page 865)
1. A frequency distribution of 150 measurements is as shown:
Class mid-point value Frequency
26.4 5
26.6 12
26.8 24
27.0 36
27.2 36
27.4 25
27.6 12
Use normal probability paper to show that this data approximates to a normal distribution and hence determine the approximate values of the mean and standard deviation of the distribution. Use the formula for mean and standard deviation to verify the results obtained.
