17. A developmental psychologist studies the number of words that seven infants have learned at a particular age. The numbers are 10, 12, 8, 0, 3, 40, and 18.

Figure the

(a) mean,

(b) median, and

(c) standard deviation for the number of words learned by these seven infants.

(d) Explain what you have done and what the results mean to a person who has never had a course in statistics.