The mean age of a group of 100 persons was found to be 32.02. Later, it was discovered that age 57 was misread as 27. Find the correct mean.
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- The mean or average number of days for someone age 12 and older in the US to smoke weed (if they smoke it at all) is 117.72 days per year. The standard deviation is 131.60. What was the NORMAL number of days per year to smoke weed?Last year, the revenue for financial services companies had a mean of 7070 million dollars with a standard deviation of 1818 million. Find the percentage of companies with revenue between 5050 million and 9090 million dollars. Assume that the distribution is normal. Round your answer to the nearest hundredth.Mario's weekly poker winnings have a mean of $353 and a standard deviation of $67. Last week he won $185. How many standard deviations from the mean is that?
- Please discuss the concepts of Mean, Median, Mode, and Standard Deviation, including when each should be used, and evaluate the differences of each. How can knowing this information about data help us?The mean and S.D. of 20 items were found to be 12 and 6 respectively. On checking it was discovered that items which should correctly read as 11 and 21 had been wrongly taken as 15 and 27 respectively. Find the correct values of mean and S.D.The weekly mean sale of a certain store is 3,884 pesos. When the measurements are reviewed it was found out that 3,221 pesos was erroneously written as 2,321. What are the actual weekly mean sales of the store?
- A successful basketball player has a height of 6 feet 11 inches, or 211 cm. Based on statistics from a data set, his height converts to the z score of 5.17. How many standard deviations is his height above the mean?Suppose that the weight of male babies less than 2 months old is normally distributed with mean 11.5 pounds and standard deviation 2.7 pounds. What proportion of babies weigh less than 9.20 pounds?Write only a number as your answer. Round to 4 decimal places (for example 0.0048). Do not write as a percentage.We want to know if there is a difference between the mean list price of a three bedroom home, μ3, and the mean list price of a four bedroom home, μ4. What is the alternative hypothesis?
