Question
The length of pregnancies (from conception to birth) of a sample of 300 women is normally distributed. The mean is 266 days and the standard
The length of pregnancies (from conception to birth) of a sample of 300 women is normally distributed. The mean is 266 days and the standard deviation is 16 days.
Do not use the Empirical Rule for the questions below. Give each answer as a number, not percent.
(a) About how many women (to the nearest whole number) had pregnancies that lasted between 260 days and 270 days?
(b) About how many women (to the nearest whole number) had pregnancies that lasted at least 270 days?
(c) About how many women (to the nearest whole number) had pregnancies that lasted at most 260 days?
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Linear Algebra and Its Applications
Authors: David C. Lay
4th edition
321791541, 978-0321388834, 978-0321791542
