Assume that blood pressure readings are normally distributed with μ= 124 and σ= 9. A researcher wishes to select people for a study but wants to exclude the top and bottom 9 percent. What would be the upper and lower readings to qualify people to participatein the study?

Q: Of the 200 American film enthusiasts, the average age is: 30 years, while the standard deviation is…

A: Normal distribution is generally denser in the center, and basically less denser at the tails. There…

Q: find the V av iance and St andard deviation

A: We have Given a pdf of X whereas X is a continuous random Variable. The expected value or mean is…

Q: If in a data set the observation 78 has z-score equal -0.60 and the observation 88 has z- score…

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Q: A sample of 3000 persons were surveyed for their weight in pounds, the mean weight is 135 lbs with a…

A: Consider that the mean and standard deviation of a random variable X are µ and σ, respectively.…

Q: Based on this graph what was the approximate distribution of the averages?  X~___(___,___)

A: Central limit theorem (CLT): According to CLT, for a given sufficiently large sample size from a…

Q: Assume that z-scores are normally distributed with a mean of 0 and a standard deviation of 1. If…

A: Let z scores are normally distributed with mean of μ=0 and standard deviation of σ=1 The value of b…

Q: Assume that the total score (from both teams) for college football games averages u = 42 points per…

A:

Q: Assume that IQ scores are normally distributed with μ = 100 and σ = 15 What percent of IQ scores…

A: The normal distribution is the most useful theoretical distribution for continuous variables.  For…

Q: Find the standard deviation of the reaction times. 0.7

A: Let X denote the reaction times of a drug. We have to calculate the SD of sample of size n = 12

Q: average heigth is 163 cm, standart deviation is 10 cm. compute p(X>168 cm) ?

A: Given,μ=163σ=10P(X>168)=?

Q: For a population, a deviation score is computed as X – σ.

A: What is Deviation score ? Deviation score is basically a degree of score from which a raw score is…

Q: The mean and standard deviation of the sampling distribution of the mean is shown as?

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Q: Suppose the value of a stock varies each day from $12 to $27 with a uniform distribution.  Find σ

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Q: The heights cleared by two athletes in a high jump event are recorded bellowed. Athlete X: 1.86 m,…

A: Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: Assume that Z-scores are normally distributed with a mean of 0 and a standard deviation of 1. If P(…

A: Given is a standard normal distribution where the cumulative distribution for all z between -b and b…

Q: If X~N(100, σ 2 ) and P(X < 106) = 0.8849, find the standard deviation, σ.

A: Here,X~N(μ,σ2)so,Here X~N(100,σ2)   → 1

Q: The speeds of cars traveling on UK motorways are normally distributed with mean 96 kilometers per…

A: We have given that.   X~N( μ , ?^2 )   μ =96 , ? = 10   Z-score =( x - μ )/?

Q: Assume that women's weights are normally distributed with a mean given by mean=143 lb and a standard…

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Q: Assume a test in biology is normally distributed with a mean of 80 and a standard deviation of 5.…

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Q: IF babies Neighto are normally distributed with a mean ot 3.23ky and a standard deviantion of 0.87kg…

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Q: Suppose that insurance companies did a survey. They randomly surveyed 450 drivers and found that 310…

A: Number of drivers who claim that they always buckle up, x=310. Number of drivers who were surveyed,…

Q: Assume that z-scores are normally distributed with a mean of 0 and a standard deviation of 1. If…

A: Let z-scores are normally distributed with a mean of 0 and a standard deviation of 1.

Q: Suppose that the blood pressure of the human inhabitants of a certain Pacific island is distributed…

A:

Q: Find and Stondard deviation X. mean of

A: Let , the probability density function of X is given below, = 0 ; otherwise Our aim is to find the…

Q: Assume that z-scores are normally distributed with a mean of 0 and a standard deviation of 1. If P…

A:

Q: Assume that the SAT test scores are normally distributed with a mean score of 1200 and a…

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Q: are approximately normally distributed, about how many applicants got scores a. above 78? b. above…

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Q: If P(−b<z<b)=0.98P(-b<z<b)=0.98, find b.

A: Given that Z ~ N(0, 1) And P(-b &lt; Z &lt; b) = 0.98

Q: Elijah earned a score of 228 on Exam A that had a mean of 200 and a standard deviation of 40. He is…

A: We have to find score required in exam b.

Q: A grocer finds that the cantaloupes in his store have weights with mean 0.7 kg and standard…

A: Given, Mean weight of cantaloupes is 700 gm. Standard deviation is 53 gm

Q: Assume that human body temperatures are normally distributed with a mean of 98.23 degrees Upper F…

A: It is given that human body temperatures follows normal distribution with mean of 98.23 and standard…

Q: Mason earned a score of 226 on Exam A that had a mean of 250 and a standard deviation of 40. He is…

A: First find the standardised Z score and the make equivalency

Q: How many Biology students’ records need to be sampled to estimate the percentage who earn "A"s to…

A: The proportion is not provided therefore in worst case it can be assume as (p) 0.5. Margin of error…

Q: If the probability of a defective bolt is 0.1, find he mean he standard deviation for the…

A: a) If the probability of a defective bolt is 0.1. Given that there are total of 400. That is, n=400…

Q: The ratio of the mode of this distribution to the median is:

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Q: The mean weight of 500 male students in a certain college is 151 lbs. and the standard deviation is…

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Q: Assume that z-scores are normally distributed with a mean of 0 and a standard deviation of 1. If…

A: It is an important part of statistics. It is widely used.

Q: Based on this graph what is the approximate distribution of data?  X~___(___,___)

A: From the data given,we try to create the histogram of the data.

Q: If P(−b<z<b)=0.206P(-b<z<b)=0.206, find b.

A: Let ' z ' be a Random variable following standard Normal distribution. i.e Z~N(0,1)To calculate:…

Q: According to the Distribution of Z table, ______ % of area is above a Z value of 0.82?

A: The normal curve is very helpful to know the area is below, above and between a Z value. If we can…

Q: The weight loss for the first six months of a diet program is normally distributed with an average…

A:

Q: Find the standard deviation for the group of data items. 5,5,5,5,7,9 ​(Simplify your answer.…

A: Solution:Computation of standard deviation:Standard deviation for the group of data items is…

Q: Assume that the distribution of scores on a college entrance exam is normally distributed with a…

A: Given data,μ=490σ=43

Q: For all parts of this problem, assume that the weights of tomatoes are normally distributed with a…

A: That means X follows N(1.8, 0.472)

Q: The mean weight of 1000 students at a certain high school is 140 pounds and the standard deviation…

A: Assuming that the weights are normally distributed.

Q: Assume that IQ scores are normally distributed with μ = 100 and σ = 15 What IQ score would be…

A: It is given that the mean is 100 and the standard deviation is 15.

Q: The speeds of motorists passing a particular point on a motorway are found to be normally…

A:

Q: Assume that z-scores are normally distributed with a mean of 0 and a standard deviation of 1. If…

A:

Q: the heights of 200 plants in a garden follow a normal distribution with mean of 72.3 cm with a…

A: Formula : Z =(X - μ)/σ