Question

The following data represent the distribution of birth weights (in grams) for babies in which the pregnancy went full term (37 to 41 weeks).
Birth Weight (g) .... Number of Live Births
0–499 ........... 22
500–999 .......... 201
1000–1499 ........ 1,645
1500–1999 ........ 9,365
2000–2499 ........ 92,191
2500–2999 ........ 569,319
3000–3499 ........ 1,387,335
3500–3999 ........ 988,011
4000–4499 ........ 255,700
4500–4999 ........ 36,766
5000–5499 ........ 3,994
(a) Construct a relative frequency distribution for birth weight.
(b) Draw a relative frequency histogram for birth weight. Describe the shape of the distribution.
(c) Determine the mean and standard deviation birth weight.
(d) Use the normal model to determine the proportion of babies in each class.
(e) Compare the proportions predicted by the normal model to the relative frequencies found in part (a). Do you believe that the normal model is effective in describing the birth weights of babies?


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  • CreatedApril 27, 2015
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