Question

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Answer 1

how far did you get?

Answer 2

do you remember the curve I drew for the previous problem?

Answer 3

that's the normal distribution or bell shaped curve

Answer 4

what's the mean in this case?

Answer 5

what is 1 standard deviation above the mean?

Answer 6

you add that to 64 to get 67.5

Answer 7

so 67.5 is one std dev above the mean

Answer 8

what is one std dev below the mean

Answer 9

that would be 2 std dev above the mean

Answer 10

because you added 2*3.5 to 64 to get 71

Answer 11

that's 1 std dev below the mean

Answer 12

how about 2 std dev below the mean?