Question

think about the process the following dot plots show the ages of two groups of tourists. what is the first step to finding the mean ag age for each group? make a comparative inference based on the mean values. group 1 group 2 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 age (years) age (years) what is the first step to finding the mean age for each group? a. the first step should be to count the number of dots for each age. b. the first step should be to find the middle number of all the dots. c. the first step should be to count the ages that have dots and just average those numbers. d. the first step should be to average the minimum and maximum values that have dots.

Explanation:

To calculate the mean age from a dot plot, you first need to know how many tourists are at each age (each dot represents one tourist). Option B refers to finding the median, not the mean. Option C is incorrect because it ignores the frequency of each age. Option D calculates a midrange, not the mean. Only Option A describes the correct first step for finding the mean.

Answer:

A. The first step should be to count the number of dots for each age.