Maternal age at childbirth. How old are women when they have
their first child? Here is...
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Maternal age at childbirth. How old are women when they havetheir first child? Here is the distribution of the age of themother for all firstborn children in the United States in a certainyear:
NOTE: The numerical values in this problem have been modifiedfor testing purposes.
AGE
COUNT
AGE
COUNT
10 to 14 years
3632
30 to 34 years
300319
15 to 19 years
251381
35 to 39 years
105975
20 to 24 years
460595
40 to 44 years
23967
25 to 29 years
422101
40 to 49 years
1978
(a) For comparison with other years and with other countries, weprefer
a histogram of the counts in each age class
a histogram of the percents in each age class
(b) How many babies were there?
babies
(c) The distribution is:
right-skewed
left-skewed
(d) In which age classes do the median and quartiles fall?
Median fall in:
40 to 44 years
10 to 14 years
45 to 49 years
20 to 24 years
15 to 19 years
25 to 29 years
30 to 34 years
35 to 39 years
Q1 fall in:
20 to 24 years
30 to 34 years
10 to 14 years
35 to 39 years
25 to 29 years
15 to 19 years
45 to 49 years
40 to 44 years
Q3 fall in:
30 to 34 years
20 to 24 years
35 to 39 years
25 to 29 years
40 to 44 years
45 to 49 years
10 to 14 years
15 to 19 years
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