Question

The mean time to assemble a piece of furniture is 52 minutes. Suppose the the assembly times are normally distributed with a standard deviation of 4.3 minutes. What percentage of assembly times fall between 47.7 minutes and 56.3 minutes?

Use the Empirical Rule

Question 1 options:

	95%
	68%
	16%
	99.7%

question 2

A survey found that the mean retail price per litre of premium grade gasoline is $1.89. Suppose the retail prices per litre are normally distributed with a standard deviation of $0.18. Between what two prices do 68% of the prices per litre fall?

Use the Empirical Rule

Question 2 options:

	$1.71 and $2.25
	$1.35 and $2.43
	$1.71 and $2.08
	$1.53 and $2.25

QUESTION 3

The mean time to assemble a piece of furniture is 52 minutes. Suppose the the assembly times are normally distributed with a standard deviation of 4.3 minutes. What percentage of assembly times fall below 39.1 minutes?

Use the Empirical Rule

Question 3 options:

	2.5%
	99.7%
	16%
	0.15%

QUESTION 4 A survey found that on average adults sleep 6.8 hours per night. Suppose that the hours per night are normally distributed with a standard deviation of 1.3 hours. 16% of the times are above what value?

Use the Empirical Rule

Question 4 options:

	9.4 hours
	8.1 hours
	2.9 hours
	10.7 hours

QUESTION 5

The mean time to assemble a piece of furniture is 43 minutes. Suppose the the assembly times are normally distributed with a standard deviation of 3.7 minutes. What percentage of assembly times are above 50.4 minutes?

Question 5 options:

	95%
	16%
	2.5%
	0.15%

Answer 1

According to empirical rule,

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Options given is incorrect $2.08 should have been $2.07

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