Exercises 5-2 1. Coffee with Meals A researcher wishes to determine the number of cups of coffee a customer drinks with an evening meal at a restaurant. Find the mean, vari- ance, and standard deviation for the distribution. X 01 2 34 P(X) 0.31 0.42 0.21 0.04 0.02

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A: The mean is 266 and the standard deviation is 15.

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A:

Q: IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. Find the IQ…

A: Excel formula: =NORMINV(0.305,0,1)=-0.5100

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Q: Mean=___________ Standard deviation=________________ Varianace=______________ oops now you…

A: Given : x 25.9 40.1 44.3 40.2 31.7 48.9 47

Q: Consider the following sample data. Sample A: Sample B: Sample C: 10, 17, 24 68, 75, 82 1,035;…

A: Mean (x¯) = ∑xn _____________________________ standard dev(s) = ∑(x-x¯)2n-1

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A: given that n=100

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

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Q: If a distribution of test scores is normal, with a mean of 78 and a standard deviation of 11, what…

A: If a distribution of test scores is normal, Mean = 78 Standard deviation = 11

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Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 261 days…

A: Given,mean(μ)=261standard deviation(σ)=13

Q: The lengths of pregnancies in a small rural village are Normally distributed with a mean of 265 days…

A: Obtain the standard z-score for the random variable X equals 239 days. The standard z-score for the…

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A: given data, normal distribution, μ=5.1σ=1.8we have to find out the 70th percentile=?

Q: Ages of Passenger Cars The average age of passenger train cars is  19.4 years. If the distribution…

A: Given μ=19.4x=22.8

Q: A sample of university students has an average GPA of 2.78 with a standard deviation of 0.45. If GPA…

A: Since, you have you have posted a question with multiple subparts we will solve first three subparts…