Find a. the mean; b. the deviation from the mean for each data item; and c. the sum of the deviations in part (b) for the following group of data items.
\[
143,147,154,156,160
\]
a. The mean is $\square$. (Simplify your answer.)

Answer

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Answer

So, the mean is $\boxed{152.0}$.

Steps

Step 1 ：Given the data items are 143, 147, 154, 156, 160.

Step 2 ：To find the mean, we add all the data items and divide by the number of data items.

Step 3 ：The mean is calculated as $ \frac{143 + 147 + 154 + 156 + 160}{5} = 152.0 $.

Step 4 ：So, the mean is $\boxed{152.0}$.