The estimate of the mean of the grouped data from calculations is; 42.5
<h3>How to find the mean of grouped data?</h3>
To find the mean of grouped data, the first step is to determine the midpoint of each interval or class. These midpoints must then be multiplied by the frequencies of the corresponding classes. The sum of the products divided by the total number of values will be the value of the mean.
The table showing the age in years and the frequency of occurrence is;
Age (years) Frequency
0 < h ≤ 20 20
20 < h ≤ 40 10
40 < h ≤ 60 10
60 < h ≤ 80 10
Thus, the midpoints are; 10, 30, 50, 70
Total of each is;
(10 * 20) + (30 * 10) + (50 * 10) + (70 * 10) = 1700
Thus, from the earlier definition we can find the mean of the grouped data as;
Mean = 1700/40
Mean = 42.5
Therefore, we can conclude that the estimate for the mean age is 42.5 years.
Read more about Grouped data mean at; brainly.com/question/548811
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