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What is the mean of this set of data: 78, 79, 80, 80, 89, 89, 92, 93, 94, 95, 95, 95?

Express your answer as a decimal number rounded to the nearest tenth.

A. 89
B. 88.6
C. 88.3
D. 92

Answer :

To find the mean of the given set of data, follow these steps:

1. Add up all the numbers in the data set.
- Data set: 78, 79, 80, 80, 89, 89, 92, 93, 94, 95, 95, 95
- Sum = 78 + 79 + 80 + 80 + 89 + 89 + 92 + 93 + 94 + 95 + 95 + 95 = 1059

2. Count the number of data points.
- There are 12 numbers in the data set.

3. Calculate the mean.
- Mean = Total sum of the data / Number of data points
- Mean = 1059 / 12 = 88.25

4. Round the mean to the nearest tenth.
- When rounded to the nearest tenth, 88.25 becomes 88.3.

Therefore, the mean of the data set, rounded to the nearest tenth, is 88.3.

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