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According to the Cellular Telecommunications Industry Association, the average local monthly cell phone bill is $42. Suppose local monthly cell phone bills are normally distributed with a standard deviation $12. What is the probability that a randomly selected cell phone bill is between $30 and $55?
Use the information given to calculate the standard error of the mean. Mean systolic blood pressure for a sample of n=324 men is =123.5, and the standard deviation is s=9.
Find the probability that 665 or fewer college students in the sample send and receive text messages with their phones? Is this result unusual?
Solve the mean and standard deviation equations
If we select, at random, a small business owned by a non-Hispanic white, what is the probability that it is a male-owned firm?
Is there sufficient evidence to support the claim that site has an effect on the amount of pesticide?
The researcher wants to determine whether there is a relation between the type of residence owned and the level of the family income. He randomly sampled 100 homeowners and obtained the following data:
The mean amount of life insurance per household in the United States is $110,000. What is the likelihood of selecting a sample with a mean of at least $112,000?
The average price of a sample of 12 bottles of diet salad dressing taken from different stores is $1.43. The standard deviation is $0.09. The average price of a sample of 16 low-calorie frozen desserts is $1.03.
The time interval between services at the station follow exponential distribution and as such the mean time taken to serve a unit is 5 minutes. What is the expected average queue length?
ssuming that the shipment includes 3% defectives, what is the probability that the shipment will be accepted? (Hint: Use the binomial distribution.)
what is the expected number of claims by males under 25? what is the standard deviation of the distribution. (How to show on excel using binodist formula).
Consider a high school basketball player that is a 70% free throw shooter. During the season, what is the probability that this player makes the third free throw in five shots (exactly 3 shots in 5 attempts)?
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