Bill kept track of the number of hours he spent exercising each week. the results for 15 weeks are shown below. find the midrange. 7.4 6.7 7.4 7.4 7.6 8.0 6.6 8.0 8.4 7.4 8.8 6.7 8.0 9.0 7.6

7.8 hours.

Step-by-step explanation:

We have been given a a data set, which represents the number of hours Bill spent exercising each week. We are asked to find the mid-range of our given data set.

Our data set is:  7.4, 6.7, 7.4, 7.4, 7.6, 8.0, 6.6, 8.0, 8.4, 7.4, 8.8, 6.7, 8.0, 9.0, 7.6

Let us arrange our given data in ascending order.

6.6, 6.7, 6.7, 7.4, 7.4, 7.4, 7.4, 7.6, 7.6, 8.0, 8.0, 8.0, 8.4, 8.8, 9

Since we know that mid-range is the mid-way between the least value and the greatest value of the data set or it is average of least and greatest data points.

We can see that 6.6 is the least data point and 9.0 is the greatest data point of our given data set.

Therefore, the mid-range of our given data set is 7.8 hours.