The length of human pregnancies from conception to birth varies according to a distribution that is approximately normal with mean 266 days and standard deviation 16 days. a)What percent of pregnancies last between 250 and 282 days? b)We know roughly 99.7% of all pregnancies fall between how many days?c) A pregnancy located in the 16th percentile would last how long? d) If 15 women are surveyed, what is the probability that 5 of them have a pregnancy that last between 250 and 266 days? e) If a woman is claiming her pregnancy is lasting longer than 90% of pregnancies, how long might her pregnancy last?

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Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.4: Distributions Of Data

Problem 19PFA

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The length of human pregnancies from conception to birth varies according to a distribution that is approximately normal with mean 266 days and standard deviation 16 days. a)What percent of pregnancies last between 250 and 282 days? b)We know roughly 99.7% of all pregnancies fall between how many days?c) A pregnancy located in the 16th percentile would last how long? d) If 15 women are surveyed, what is the probability that 5 of them have a pregnancy that last between 250 and 266 days? e) If a woman is claiming her pregnancy is lasting longer than 90% of pregnancies, how long might her pregnancy last?

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...

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