Mathematics, 27.04.2021 16:40 samyajones68

(The ages in years of a study group are 12, 13, 13, 13, 14, and 15. Another 12-year-old joins their group. In what ways does this new member's age affect the mean and standard deviation?
F The mean increases the standard deviation increases
The mean increases, the standard deviation decreases
H The mean decreases, the standard deviation increases
J The mean decreases, the standard deviation decreases
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(The ages in years of a study group are 12, 13, 13, 13, 14, and 15. Another 12-year-old joins their...