The pregnancy length in days for a population of new mothers can be approximated by a normal distribution with a mean of 267 days and a standard deviation of 10 days. (a) What is the minimum pregnancy length that can be in the top 9% of pregnancy lengths? (b) What is the maximum pregnancy length that can be in the bottom 6% of pregnancy lengths? (a) The minimum pregnancy length is (Round to one decimal place as needed.) days.

Q: The mean lifetime income of high school graduates in the United States is 2 million dollars higher…

A: @solution:::   Given data : typical high school student 7.5 hours 180 days  for 4 years  For…

Q: A researcher want to determine an interval estimate for the average weight of adult gorillas in…

A: Given confidence level=99%Margin of error(E)=8.3standard deviation(σ)=15.2

Q: The graph illustrates the distribution of test scores taken by College Algebra students. The maximum…

A: We have given that Mean(µ) = 78Standard deviations (σ) = 8 We will find the required probability by…

Q: Suppose the lifetimes of a certain lightbulb are normally distributed with a standard deviation of…

A: From the provided information, Standard deviation (σ) = 100 Let µ be the required mean. X~N (µ, 100)…

Q: Suppose the distribution of typing speeds in words per minute for experienced typists can be…

A: The provided information is:

Q: IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. a) Draw a…

A: The provided information is  µ=100 σ=15 a. The detailed sketch is

Q: = The annual rainfall in a certain region is approximately normally distributed with mean = 41.8…

A: Mean(µ) = 41.8Standard deviations (σ) = 5.6X ~ N (µ, σ )= N(41.8, 5.6)

Q: Assume the average number of fatal crashes caused by sleep-deprived drivers each year is 2,000.…

A: It is a problem of normal distribution in which we have to find out the number of fatal cases in a…

Q: The distribution of average speeds of the top 53 drivers in NASCAR is roughly symmetric, unimodal,…

A: (a) Draw the normal curve with the values from Z=–3 to Z=3 The below graph represents the normal…

Q: IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. What…

A: Obtain the z-score for the random variable X equals 85. The z-score for the random variable X equals…

Q: A researcher want to determine an interval estimate for the average weight of adult gorillas in…

A: From the provided information, Confidence level = 90% Margin of error (E) = 3.1 Standard deviation…

Q: The lives (in hours of continuous use) of 100 randomly selected flashlight batteries are: Interval…

A: According to the given data, first form the following table:IntervalFrequency(fi)Midpoint(xi…

Q: Suppose a population is known to be normally distributed with a mean, equal to 116 and a standard…

A: The percentage of the population would be between 116 and 144 is obtained below:It is given that the…

Q: Suppose the exam average in a class is 82% with a standard deviation of 2. What proportion of…

A:

Q: Lecture(10.1a): The mean of the population is 50. The standard deviation is 10. (a) if a persons's…

A:

Q: Suppose the distributions of arrival and service times were normal instead of exponential.  Let the…

A: The objective of this question is to estimate the long-run average number of people that would be in…

Q: Suppose your manager indicates that for a normally distributed data set you are analyzing, your…

A: we have to find percentage of data fall within 0.8 sd of mean (between z = -0.8 and z = 0.8)

Q: A normal population has the mean m=70 and standard deviation 20. what proportion of the population…

A: Obtain the proportion of the population is greater that 95. The proportion of the population is…

Q: What is the minimum sample size necessary to estimate the population mean? Round your answer up to…

A: Given that, Confidence level (C)=99%=0.99α=1-C=1-0.99=0.011-α2=1-0.012=0.995Margin of error…

Q: the mean is 146, and standard deviation is 35. A score of 181 is how many z-scores above the mean?

A:

Q: How many miles did you drive in the last 7 days (n = 110)? The mean is 86 and standard deviation is…

A:

Q: The graph illustrates the distribution of test scores taken by College Algebra students. The maximum…

A: Empirical Rule:   The percentage of values lies between one standard deviation from the mean is…

Q: Suppose that the hemoglobin levels among healthy females are normally distributed with a mean of 14.…

A: Question: Suppose that the hemoglobin levels among healthy females are normally distributed with a…

Q: Suppose the exam average in a class is 55% with a standard deviation of 4. What proportion of…

A: The random variable score follows normal distribution. The population mean is 55.         The…