This is because it is the most frequent value in the list (ie it shows up the most). The value 40 shows up twice while every other value only shows up once.
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Problem 3
<h3>The mean is 40</h3>
To get the mean, you add up the time values to get 39+42+41+38+39+39+42 = 280
Then divide that result by 7 since there are 7 values, so we get 280/7 = 40
