The National Center for Health Statistics publishes information about birth rates (per 1000 population) in the document National Vital Statistics Report. The following table provides a frequency distribution for birth rates during one year for the 50 states and the District of Columbia.

a. Obtain a frequency histogram of these birth-rate data.
b. Based on your histogram, do you think that birth rates for the 50 states and the District of Columbia are approximately normally distributed? Explain your answer.

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Rate Frequeney Rate Frequency 10-under 11 11-under 12 12-under 13 13-under 14 14-under 15 15-under 16 16-under 17 17-under 18 18-under 19 19-under 20 20-under 21 21-under 22 10 17