The approximate percentage of lightbulb replacement requests numbering between 54 and 58 is  %. (Do not enter the

Q: Assume that the speed of automobiles on an expressway during rush hour is normally distributed with…

A: The required Percentage is, 3.6%  the detailed solution is as follows below:

Q: The lengths of brook trout caught in a certain Colorado stream are normally distributed with a mean…

A: Given that :  Mean = 14 inches S. D = 3 inches Here we use standard normal distribution concept…

Q: The speeds of all cars on the tollway was found to be normally distributed with a mean of 63 miles…

A: It is given that that µ=63 mile per hour. Obtain the standard deviation of the speeds of all cars:

Q: Women's heart beats per minute  are normally distributed with a mean of 72bpm and a std. dev. of…

A: We have to find the percent of women who would have heartbeats between 48bpm and 96bpm.

Q: The lifespans of certain 350 sample cricket insects are normally distributed. it is found that 15%…

A: Let, X be the life span. μ =mean σ= sd

Q: The gestation period for human births can be taken as normally distributed with a mean of 256 days…

A: Given: The gestation period for human births can be taken as normally distributed with a mean of 256…

Q: A set of wrist watch prices are normally distributed with a mean of 76dollars and a standard…

A: From the provided information, Mean (µ) = 76 Standard deviation (σ) = 10 X~N (76, 10) Here X be a…

Q: The combined SAT scores for students at a local high school are normally distributed with a mean of…

A: X follows a Normal distribution with mean = 1497 and S.D = 293 Then z=(x-mean)/SD = (x-1497)/293…

Q: A businessman calculated the average price of variety A rice per kilo at ₱32.00 with a standard…

A: First calculate sample mean and sample standard deviation for rice B varieties using Excel

Q: A random sample of 100 male students is drawn from a particular class. The mean and standard…

A:

Q: The gestation period for human births can be taken as normally distributed with a mean of 266 days…

A: Given:

Q: The physical plant at the main campus of a large state university recieves daily requests to replace…

A: Let X be the number of daily requests following bell-shaped distribution with mean 57 and standard…

Q: ifty refrigerators from two different models of a refrigerator manufacturer are compared to see if…

A: Hypothesis testing plays a major role in research and development. To diagnose the underlying cause…

Q: Data accumulated by the National Climatic Data Center shows that the average wind speed in miles per…

A:

Q: Deer mice are small rodents native to North America. Their adult body length are known to vary…

A:

Q: The time required for an automotive center to complete an oil change service on an automobile…

A: the PDF of normal distribution is = 1/σ * √2π * e ^ -(x-u)^2/ 2σ^2standard normal distribution is a…

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 267 days…

A: μ = 267σ = 13 C = 95% α = 1 - 0.95    = 0.05 α2 = 0.025  zα2 = ±1.96 The middle 95% of most…

Q: ssume that the speed of automobiles on an expressway during rush hour is normally distributed with a…

A: The normal distribution  in the center are generally denser and basically less denser at tails.…

Q: Find the standard deviation using 2 methods. And identify it is a grouped data or ungrouped data

A: Solution To calculate the standard deviation firstly we will use mid point.

Q: Find the standard deviation of these battery lifetimes, if 90% of these batteries do not achieve a…

A: Here given ,  The lifetimes of a certain brand of battery are assumed to be normally distributed…

Q: he breaking strengths of cables produced by a certain manufacturer have historically had a mean of…

A: as per bartleby guideline expert have to answer first three subpart only dear student please upload…

Q: Assume that weights of adult females are normally distributed with a mean of 79 kg and a standard…

A: Mean(μ)=79standard deviation(σ)=22

Q: According to a recent report the battery life for a new line of laptop computers has a mean of 9…

A: The normal distribution:A continuous random variable X is said to follow normal distribution if the…

Q: The lengths of brook trout caught in a certain Colorado stream are normally distributed with a mean…

A: Mean==14Standard deviation==3

Q: The physical plant at the main campus of a large state university recieves daily requests to replace…

A:

Q: The lifetimes of a certain type of calculator battery are normally distributed. The mean lifetime is…

A: Given,mean(μ)=400standard deviation(σ)=50

Q: The breaking strengths of cables produced by a certain manufacturer have historically had a mean of…

A: We want to test the hypothesis

Q: Assume that weights of adult females are normally distributed with a mean of 77 kg and a standard…

A: Population mean, µ = 77 kg Population standard deviation, σ = 22 kg Let, X be the weights of adult…

Q: The time to make a batch of plastic bottles is normally distributed with a mean of 45 seconds. New…

A:

Q: Assume that the speed of automobiles on an expressway during rush hour is normally distributed with…

A: The question is about normal distribution Given : Popl. mean speed of automobile on an expressway…