The correct answer to the question is option B. 48
The Mean of a set of data can be obtained by taking the Summation of the data divided by the number of data i.e

With the above formula, we can obtain the mean of the data given in the question above as follow:
Summation of data = 60 + 45 + 20 + 70 + 45
= 240
Number of data = 5
<h3>Mean =? </h3>

<h3>Mean = 48</h3>
Therefore, the mean of the data is 48.
Thus, option B. 48 gives the correct answer to the question.
Learn more: brainly.com/question/9243551
Answer:
chemical to thermal and chemical energy to electromagnetic energy