In a mid-size company, the distribution of the number of phone calls answered each day by each of the 12 receptionists is bell-shaped and has a mean of 38 and a standard deviation of 8. Using the Standard Deviation Rule (as presented in the book), what is the approximate percentage of daily phone calls numbering between 30 and 46?

Q: percentage of," 2013). Consider a group of 200 people. Find the mean and the standard deviation of…

A: Let a random experiment be performed repeatedly. Let the occurrence of an event in a trial is called…

Q: When Morgan runs the 400 meter dash, her finishing times are normally distributed with a mean of 81…

A: From the information, given thatLet X denotes the finishing times which follows normal distribution…

Q: Suppose the mean height in inches of all 9th grade students at one high school is estimated. The…

A: Given that  Sample size n =9 Population standard deviation =3

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A:

Q: The ages of the members of a popular ski club is normally distributed with a mean of 46 years and a…

A: Given that the ages of the members of a popular ski club is normally distributed with a mean of 46…

Q: In a normally distributed data set with a mean of 24 and a standard deviation of 4.2, what…

A:

Q: Assume that the mathematics scores on the SAT are normally distributed with a mean of 500 and a…

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Q: A history class has 95 members. If there is a 22% absentee rate per class meeting , find the mean…

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Q: 58.6. Assume that 107 men and 244 women were sampled, and that the standard deviations were 24.3 for…

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A: The formula for mean of the Z-score is, Z=x¯-μσn Here n is the sample size, μ is the population mean…

Q: The mean rate for cable t.v.from a sample of 80 households was $29 per month with a standard…

A:

Q: Suppose the mean height in inches of all 9th grade students at one high school is estimated.

A: Population standard deviation, σ =3 inches Sample size n=6

Q: heights of adult women in the United States are normally distributed with a mean of 65 inches and a…

A: The z score can be calculated as: z=x-μσ The required z score that is associated with the top 10% or…

Q: Suppose the prevalence of type II diabetes in a community is 36%. Researchers want to sample 16…

A:

Q: One year Sam had the lowest ERA (earned-run average, mean number of runs yielded per nine innings…

A: From the provided information, The mean and standard deviation for the males ERA are as follow: Mean…

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Q: If an adult male is told that his height is within 2 standard deviations of the mean of the normal…

A: If an adult male is told that his height is within 2 standard deviations of the mean.

Q: Assume that the mathematics scores on the SAT are normally distributed with a mean of 500 and a…

A: The mean is 500 and the standard deviation is 100.

Q: For each day of last year, the number of vehicles passing through a certain intersection was…

A: The engineers are recording the number of vehicles passing through a certain intersection to…

Q: have a mean GPA of 2.57 with a standard deviation of 0.71. how many of the 850 new students have a…

A: Given that.   X~N( μ , ?)   μ=2.57   , ?=0.71    Z-score =( x - μ )/?

Q: Suppose that the antenna lengths of woodlice are approximately normally distributed with a mean of…

A: we have to find given probability..

Q: Assume that the mathematics scores on the SAT are normally distributed with a mean of 500 and a…

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Q: For a random sample of  70  overweight men, the mean of the number of pounds that they were…

A: given data  n = 70 x¯ = 28 poundsσ = 3.8 poundsbest point estimate for population mean  = ?

Q: Ted had the lowest ERA​ (earned-run average, mean number of runs yielded per nine innings​ pitched)…

A: According to the given information in this question We need to find the z score

Q: One year thomas had the lowest ERA​ (earned-run average, mean number of runs yielded per nine…

A: GivenThomas has an ERA of 2.67 and Sarah has an ERA of 2.99For males,For femalesTo find the z-score…

Q: Assume the annual day care cost per child is normally distributed with a mean of ​$9000 and a…

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Q: Is it worth pursuing a doctoral degree in education if you already have an undergraduate degree? One…

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Q: In one town, the number of pounds of sugar consumed per person per year has a mean of 6 pounds and a…

A: In one town, the number of pounds of sugar consumed per person per year has a mean of 6 pounds and a…

Q: In a normally distributed data set of how long customers stay in your store, the mean is 43.5…

A: Given data Mean μ = 43.5 Standard deviation σ = 3.9 95% of your customers to stay in your store.…

Q: day. Which of the following z-scores represents someone who watches 1.5 hours of TV per day? A) z=…

A: It is given that  Mean, μ = 3 Standard deviation, σ = 0.5 Z-Score, Z = ( X - μ )/σ

Q: Suppose that salaries for recent graduated of one university have a mean of $25,500 with a standard…

A:

Q: Assume that the mathematics scores on the SAT are normally distributed with a mean of 500 and a…

A: normal distributionμ = 500σ = 100P(570<x<640) = ?

Q: Suppose that the amount of caffeine (in milligrams) in an 16 fluid ounce energy drink can be modeled…

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Q: If the weekly grocery expenditure of households in a certain urban market is known to be normally…

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Q: Suppose the test scores in a class are normally distributed with a mean of 70 and a standard…

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Q: Is it worth pursuing a doctoral degree in education if you already have an undergraduate degree? One…

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Q: ne year Terry had the lowest ERA (eamed-run average, mean number of runs yielded per nine inhings…

A: According to the given information in this question we need to find the z scores of both

Q: (a) between 56 and 74. % (b) above 68. % (c) below 56. %

A: here as per guideline i have calculated 3 subparts , plz repost for remainning. Suppose that the…

Q: Suppose that the heights of 4-year old boys are normally distributed with a mean of 103cm and a…

A: Let X be the random variable from normal distribution with mean (μ) = 103 cm and standard deviation…

Q: Suppose the heights of women at a college are approximately Normally distributed with a mean of 65…

A: The objective of this question is to find the height that corresponds to the 40th percentile in a…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.