Suppose the mean weight of school children's book bags is 17.5 pounds, with standard deviation 2.2 pounds. Find the probability that the mean weight of a sample of 30 book bags will exceed 18 pounds.
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- There is an 85% chance that a randomly selected person will take their own re-usable bags to the grocery store.a. If 20 shoppers are randomly selected, what is the mean and standard deviation for the number of people what will use their own re-usable bags at the grocery store?A researcher measures the amount of sugar in several cans of the same soda. The mean is 39.01 with a standard deviation of 0.5. The researcher randomly selects a sample of 100. If the researcher wants to find the probability that the sum of the 100 values is greater than 3,910, what is the mean and standard deviation that should be used? mean=??? standard deviation=????The golf scores for a school team were normally distributed with a mean of 68 and a standard deviation of three.Find the probability that a golfer scored between 66 and 70
- The mean monthly rent for a one-bedroom apartment without a doorman in Manhattan is $ 2,650 . Assume the standard deviation is $500. A real estate firm samples 100 apartments. What is the probability that the average rent of the sample is more than $ 2,708 ?The amount of soda in a randomly selected bottle varies according to a normal distribution with mean 6 ounces and standard deviation 7.9 ounces. What is the probability that a randomly selected bottle will be less than 6 ounces? Enter your answer as a decimalIn an all boys school, the heights of the student body are normally distributed with a mean of 71 inches and a standard deviation of 4.5 inches. Out of the 1912 boys who go to that school, how many would be expected to be between 61 and 70 inches tall, to the nearest whole number? Statistics Calculator
- From a population of 2000 elements, the standard deviation is known to be 14. A sample of 49 elements is selected. It is determined that the sample mean is 56.what is the standard error of the mean is?3. A study of the amount of time it takes to rebuild the transmission for a 2005 Chevy Cavalier shows that the mean is 8.4 hours and the standard deviation is 1.8 hours. Find the probability that their mean rebuild time exceeds 8.7 hoursThere are 8,000 students at the School of Management, UT Dallas. The average age of all the students is 24 years with a standard deviation of 3.7 years. What is the smallest sample size such that the standard deviation of the sample mean is 0.43 years or less? (Enter an integer number.)