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108. The scores on a statistics test had a mean of 81 and
a standard deviation of 9. One student was absent
on the test day, and his score wasn't included in the
calculation. If his score of 84 was added to the distri-
bution of scores, what would happen to the mean and
standard deviation?
(a)
Mean will increase, and standard deviation will
increase.
(b)
Mean will increase, and standard deviation will
decrease.
(c)
Mean will increase, and
standard deviation will stay
the same.
(d)
Mean will decrease, and standard deviation will
increase.
(e)
Mean will decrease, and standard deviation will
decrease.

Sagot :

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