Weights(oz)

Frequency

4.5 - 6.0-15

6.1 - 7.6-6

7.7 - 9.2-2

Above is a chart made from a sample of weights of babies born at a LA General Hospital.

a) Determine the mean and standard deviation of the weights. Be sure to round appropriately and label with the correct units.

b) Which standard deviation did you use and why? When would you use the other standard deviation?

c) Determine the cutoffs for unusual values, and if 9.2 would be an unusual weight.

Ddetermine the class width