The wieghts of a set of moving boxes on a truck have a mean of 22 pounds and a standard deviation of 3 pounds. Another

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Source: Magoosh

The weights of a set of moving boxes on a truck have a mean of 22 pounds and a standard deviation of 3 pounds. Another 2 boxes are loaded onto the truck, one with a weight of 26 pounds and the other with a weight of 18 pounds. What effect does this have on the standard deviation of the weights of the boxes on the truck?

A. The standard deviation does not change
B. The standard deviation increases
C. The standard deviation decreases
D. It is not possible to determine whether the standard deviation decreases or stays the same, but it does not increase
E. It is not possible to determine whether the standard deviation decreases or stays the same, but it does not decrease

The OA is B