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A population of N = 100 scores has a mean of 10 and a standard deviation of 4. If another 25 individuals, all with scores

A population of N = 100 scores has a mean of 10 and a standard deviation of 4. If another 25 individuals, all with scores of X = 2, are added to this distribution, what will happen to the mean and standard deviation?

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The mean will be unchanged and the standard deviation will decrease

The mean will be unchanged and the standard deviation will increase

The mean will decrease and the standard deviation will be unchanged

The mean will decrease and the standard deviation will increase

The mean will decrease and the standard deviation will decrease

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