Question

part 2 of 2
(b)
mean = 26.6
standard deviation =

Explanation:

Step1: Calculate the difference between two consecutive values

Take two consecutive values, for example, $23.8$ and $21$. The difference is $23.8 - 21=2.8$.

Step2: Verify with another pair

Take another pair of consecutive values, say $26.6$ and $23.8$. The difference is $26.6 - 23.8 = 2.8$.
Since in a normal - distribution graph (bell - curve), the distance between consecutive marked points (assuming they are at intervals of one standard deviation from the mean) gives the standard deviation. Here, the distance between consecutive values is $2.8$. So the standard deviation is $2.8$.

Answer:

$2.8$