SOLUTION: The weights for newborn babies is approximately normally distributed with a mean of 6.9 pounds and a standard deviation of 1.3 pounds. Consider a group of 1300 newborn babies:

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Question 1170954: The weights for newborn babies is approximately normally distributed with a mean of 6.9 pounds and a standard deviation of 1.3 pounds.
Consider a group of 1300 newborn babies:
1. How many would you expect to weigh between 2.9 and 8.2 pounds?
2. How many would you expect to weigh less than 5.6 pounds?
3. How many would you expect to weigh between 5.6 and 9.5 pounds?

Answer by CubeyThePenguin(3113) About Me  (Show Source):
You can put this solution on YOUR website!
mean = 6.9
-+ 1 std dev = 5.6, 8.2
-+ 2 std dev = 4.3, 9.5
-+ 3 std dev = 2.9, 12.8

a) between 3 and 8 pounds: from -2 to 1 on the chart ---> 81.5%
(1300)(81.5%) = 1059 (rounded down to the nearest integer)

b) less than 6 pounds: everything to the left of -1 on the chart ---> 16%
(1300)(16%) = 208

c) between 5.6 and 9.5 pounds: from -1 to 2 on the chart ---> 81.5%
(1300)(81.5%) = 1059 (rounded down)