The duration of childbirths are normally distributed. The mean is 268 days with a standard deviation amounting to 15. What is the probability of a childbirth that lasts less than 250 days?

Q: Almost all medical schools require applicants to take the Medical College Admission Test (MCAT).…

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Q: Kira recently switched her primary doctor to one specializing in caring for elderly patients. On her…

A: a) The test hypotheses are: Null hypothesis: H0: μ =115 mmHg.

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A: Givensample size(n)=10Mean(x)=125standard deviation(s)=24significance level=0.05

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Q: The sample standard deviation is one measure that describes the value in the sample that the data…

A: A single number that seeks to represent a set of data by identifying the center position within that…

Q: The average salary for a food scientist is $66,000.  The standard deviation is $1,500   What…

A: Normal distribution, also known as the Gaussian distribution, is a probability distribution that is…

Q: Your friend, Jaye, who is also enrolled in a statistics class, just got their grade on the first…

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Q: On average, 120 minutes are required to complete and upload the answer booklet in an exam, with a…

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Q: In general, the larger the animal the longer the length of pregnancy (also called gestation period).…

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Q: The mean of a normal distribution is 400 pounds. The standard deviation is 10 pounds. What is the…

A: The mean is 400 and the standard deviation is 10.

Q: A machine used to fill gallon-sized paint cans is regulated so that the amount of paint dispensed…

A: Given that mu = 138 s.d = 0.4

Q: The systolic blood pressure of adults in the USA is nearly normally distributed with a mean of 120…

A: From the provided information, Mean (µ) = 120 Standard deviation (σ) = 17 Let X be a random variable…

Q: mandatory competency test for high school sophomores has a normal distribution with a mean of 329…

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Q: A large chemistry course took their final exam. The mean was 75 with a standard deviation of 8. What…

A: Let us define the random variable , X. Let X represent the final exam scores. Here X follows Normal…

Q: find the probability that next March Roanoke receives a) less than 1.84 cm of rain; b) more than 5…

A: Let X denote the rainfall in Roanoke for the month of March. Given that X follows N(mean = 8.22, SD…

Q: Loretta, who turns eighty this year, has just learned about blood pressure problems in the elderly…

A: Consider that a random variable X has expected value μ and standard deviation, σ. Now, according to…

Q: A large chemistry course took their final exam. The mean was 75 with a standard deviation of 8. What…

A: Given Information:  Mean (u) = 75  Standard Deviation (s) = 8  To find: Exam scores that separates…

Q: The results of a common standardized test used in psychology research is designed so that the…

A: From the given information,Population mean (µ) = 135.Standard deviation (σ) = 40.

Q: The average heart rage is 18 inches in length with a standard deviation of.5 inches.  Research shows…

A: From the given information,   Mean = 18 Standard deviation = 5

Q: Kala recently switched her primary doctor to one specializing caring for elderly patients. On her…

A: The following information has been given: The population mean is μ=115. The sample size is n=21. The…

Q: Most graduate schools of business require applicants for admission to take the Graduate Management…

A: It is given that the mean and standard deviation are 527 and 112, respectively.

Q: A banker finds that the number of times people use automated-teller machines (ATMs) in a year are…

A: Solution-: Given: μ=40, σ=11 We want to find the proportion of customers who use ATMs less than…

Q: The amount of time people spend at the gym follows a uniform distribution from 45 to 90 minutes.…

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Q: Amanda, who turns eighty years old this year, has just learned about blood pressure problems in the…

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Q: Employees at Executive Management Co. spend an average of 80 minutes on the phone each day. If the…

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Q: In a reading class students can read an average of 181 words per minute with a standard deviation of…

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Q: Salma recently switched her primary doctor to one specializing in caring for elderly patients. On…

A: From the provided information, Sample size (n) = 9 Sample mean (x̄) = 124 Sample standard deviation…

Q: Fun Inc. has a corporate fun day every year (except this one) which features an obstacle course…

A: Given, The correlation between race time and pickup distance 0.746   The course is carefully setup…

Q: Rachel, who turns eighty years old this year, has just learned about blood pressure problems in the…

A: The question is about Chebyshev's theorem Given : Mean systolic blood pressure ( μ ) = 134.2 mmHg…

Q: The reading speed of sixth - grade students is approximately normal, with a mean speed of 125 words…

A: We have given that  Reading speed of sixth - grade students is approximately normal, with a mean…

Q: Raul received a score of 76 on a history test for which the class mean was 70 with a standard…

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Q: Raul received a score of 77 on a history test for which the class mean was 70 with a standard…

A: Define History as H and biology as B. Given: H=77μH=70σH=9B=75μB=70σB=4

Q: According to government reports, the heights of adult male residents of the United States are…

A: Mean = 69.0 Standard deviation = 2.8

Q: The results of a common standardized test used in psychology research is designed so that the…

A: Given that  μ = 145 , σ =50 , At X=145 Formula for Z-score  Z-score=(X-μ)/σ Note: According to…

Q: Your hospital has just reset the safety stock level for sleeping pills to be 205 pills. If your…

A: Given that the hospital keeps a stock of 205 pills. μ=1441σ=78.544

Q: Ann recently switched her primary doctor to one specializing in caring for elderly patients. On her…

A: GivenMean(x)=128standard deviation(s)=25sample size(n)=10sinificance level(α)=0.10

Q: Amanda recently switched her primary doctor to one specializing in caring for elderly patients. On…

A: The following information has been given: μ=115          s=23x¯=123          n=17

Q: In a certain university, math SAT scores for the entering freshman class averaged 650 and had a…

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Q: A new chemical has been found to be present in the human blood stream, and a medical group would…

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Q: A placement test for the state university freshmen has a normal distribution with a mean of 700 and…

A: Let X  be the test score. It is given that , a placement test for the state university freshmen has…

Q: Heather, who turns eighty years old this year, has just learned about blood pressure problems in the…

A: a) Consider that a random variable X has expected value μ and standard deviation, σ. Now, according…

Q: a recent awards ceremony, the age of the winner for best actor was 42 and the age of the winner for…

A: Given See the handwritten solution

Q: The honors program at Brad's university only accepts students with an entrance exam score over 400.…

A: From the provided information, Mean (µ) = 250 Standard deviation (σ) = 80 Let X be a random variable…

Q: The average price of a personal computer is $949. If the computer distributed with a standard…

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Q: A machine used to fill gallon-sized paint cans is regulated so that the amount of paint dispensed…

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Q: Mark recently took a road trip across the country. The number of miles he drove each day was…

A: We have given that  X~N(mu,sigma^2) mu=450 ,X=431.8 and Z-socre =-0.7

Q: A professor gave final examination to 110 students. Eighteen students had scores that were more than…

A: Consider that a professor gave a final examination to 110 students. 18 students had had examination…

Q: An economist would like to estimate the mean amount of money that a family spends to within $82. If…

A: We have given that,  Margin of error (E) = 82, standard deviation (σ) = 490 confidence level (c) =…