What is the standard deviation of the data set? 7,3,4, 2, 5, 6,9

2.4103

Step-by-step explanation:

The first step in evaluating the sample standard deviation of a data set involves the determination of the sample mean.

The sample mean is simply the average value of the data set;

sample mean =

The next step is to evaluate the sum of the squares of deviations from the mean;

sum of squares of deviation =

We then divide the sum of squares of deviation by (n-1) where n is the sample size to obtain the sample variance;

variance =

The standard deviation is simply the square-root of variance;

b. 2 and 4

step-by-step explanation: