Question

a track coach, recorded the number of runners on all the nearby track teams. 39 39 74 74 74 74 74 83 83 the number of members that a randomly chosen team has. what is the expected value of write your answer as a decimal.

Explanation:

Step1: Count the number of data - points

There are 10 data - points: 39, 39, 74, 74, 74, 74, 74, 83, 83.

Step2: Calculate the sum of all data - points

\[39\times2 + 74\times5+83\times2=78 + 370+166 = 614\]

Step3: Calculate the expected value

The expected value (average) is the sum of all data - points divided by the number of data - points. So, \(\frac{614}{10}=61.4\)

Answer:

61.4