The manager of a grocery store has selected a random sample of 100 customers. The vege length of time it k these 100 customers to check out was 30 minutes. It is known that the standard deviation of the checkst time is minute With a 90 probability, the sample mean will provide a margin of error of 0.3645 10 .196 1.96

Q: Assume that adults have IQ scores that are normally distributed with a mean of 105 and a standard…

A:

Q: The processing time for the robogate has a normal distribution with mean 23 sec and standard…

A: Given: The mean of the processing time μ=23 sec The standard deviation σ=2 sec.

Q: Assume that readings on thermometers are normally distributed with a mean of 0 and a standard…

A:

Q: Using the formulas, calculate the (i) mean and (ii) standard deviation of X.

A: Let p be the probability of shot that scored points. Given that p = 61.3% = 0.613 Given that X= the…

Q: The chemical concentration of a particular chemical in a lake is to be measured. Assume it is known…

A: We have to find given probability.

Q: After a researcher adds 6 points to every score in a sample, the standard deviation is found to be s…

A: The question is about change of origin.Introduction :Change of origin :If a no. is added /…

Q: The mean amount of time it takes a kidney stone to pass is 15 days and the standard deviation is 4…

A: GivenMean(μ)=15standard deviation(σ)=4

Q: A particular fruit's weights are normally distributed, with a mean of 522 grams and a standard…

A: GivenMean(μ)=522standard deviation(σ)=32sample size(n)=20

Q: A distribution of values is normal with a mean of 189.6 and a standard deviation of 68.6. Find the…

A: Refer to Standard normal table/Z-table to find the probability of z= 1.5.ORUse excel formula…

Q: ores are normally distributed with a mean of 1518 and a standard deviation of 325. If 1 SAT score…

A: Given: μ=1518, σ=325 The corresponding z-value needed to be computed is: If 1 SAT score is randomly…

Q: he time it takes for a statistics professor to mark a single midterm test is normally distributed…

A: Given Data: μ=4.9σ=1.9   Using central limit theorem ∑X ~ Normal (n×μ, n×σ2)∑X ~ Normal (269.5,…

Q: Assume that blood pressure readings are normally distributed with a mean of 135 and a standard…

A: According to the given information, we have Mean = 135 Standard deviation = 4.7 Sample size = 35

Q: Assume that the readings on thermometers are normally distributed with a mean of 0 degrees Celsius…

A: We have given that Mu= 0 , sigma =1 X~ N ( 0, 1) Zscore=(x-mu)/sigma

Q: Assume that blood pressure readings are normally distributed with a mean of 123 and a standard…

A:

Q: An unknown distribution has a mean of 40 and a standard deviation of 8. A sample size of 50 is drawn…

A: Given Information is -Sample size, .Mean, .Standard deviation, .

Q: The percent of fat calories that a person in America consumes each day is normally distributed with…

A: Let  be the percent of fat calories that a person in America consumes each day.The random variable…

Q: Assume IQ scores for adults are normally distributed with a mean of 100 and a standard deviation of…

A:

Q: The life of light bulbs is distributed normally. The standard deviation of the lifetime is 20 hours…

A: Denote X as the life of a randomly selected light bulb.

Q: Assume the random variable X is normally distributed with a mean of 50 and a standard deviation of…

A:

Q: The lengths of pregnancies are normally distributed with a mean of 267 days and a standard deviation…

A: Let  x denote the length of pregnancies. Given that the lengths of pregnancies are normally…

Q: 18 men will be tested for the discus throw. if Mu= 112ft and standard deviation= 13ft. find the…

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

Q: Assume the random variable  has a mean of 30 and a standard deviation of 6. Consider taking repeated…

A: For the given random variable, the specified parameters are:The mean, μ=30.The standard deviation,…

Q: Provide the null and alternative hypotheses used to address these problems. Make sure that your…

A: It is needed to find the null and alternative hypotheses.

Q: Assume that adults have IQ scores that are normally distributed with a mean of 99.9 and a standard…

A: Given that, Mean = 99.9 Standard deviation = 24.5

Q: The average amount of money spent for lunch per person in the college cafeteria is $7.36 and the…

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Q: The average American man consumes 9.9 grams of sodium each day. Suppose that the sodium consumption…

A: Normal distribution:If a random variable X follows normal distribution with mean µ and the standard…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard…

A: As given the IQ scores of adults are normally distributed with a mean ( µ ) = 100 and standard…

Q: Assume that adults have IQ scores that are normally distributed with a mean of u = 100 and a…

A: Let X be the random variable from normal distribution with mean (μ) = 100 and standard deviation (σ)…

Q: The probability that a randomly chosen student in a statistics class submits his/her homework on…

A: Given: The probability that a randomly chosen student in a statistics class submits his/her homework…

Q: On a planet far far away from Earth, IQ of the ruling species is normally distributed with a mean of…

A: Given, the IQ of an individual of the ruling species follows normal distribution with mean 102 and…

Q: The probability that a randomly chosen student in a statistics class submits his/her homework on…

A: