a) The modal class of time spent exercising is of: 50 < x ≤ 60.
b) The median class of time spent exercising is of: 20 < x ≤ 30.
<h3>How to obtain the measures?</h3>
First we obtain the modal class, which is the class with the highest number of observations.
The table gives the absolute frequencies, which are the number of observations in each class, hence the modal class is given as follows:
50 < x ≤ 60.
As it has 21 observations, which is the highest number of observations.
The median of the distribution is the middle value of the distribution, which is the value of which half the distribution is less than and half is greater than.
This distribution has 79 scores, hence the median class is the class in which the (79 + 1)/2 = 40th score is, which is given by:
20 < x ≤ 30.
As:
- The first 12 observations are between 0 and 10.
- The first 30 observations are between 0 and 20.
- The first 41 observations are between 0 and 41, with the 40th appearing in the interval 20 < x ≤ 30.
<h3>Missing Information</h3>
The table is given by the image shown at the end of the answer.
More can be learned about median and mode at brainly.com/question/14532771
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