Instruction: Please help me to answer all the questions correctly. Suppose that 12.5% of horses live over 23.4 years, while 88 8/9% live less than 25.2 years. What are the mean and standard deviation for the life expectancy of horses? a. mean = 23.83; standard deviation = 0.22 b. mean = 22.69; standard deviation = 4.97 c. mean = 21.6 ; standard deviation = 1.8 d. mean = 20.14; standard deviation = 4.86 There are five whole numbers in a data set. The mean of the data is 10. The median and mode are both 9. The least number in the data set is 7, and the greatest is 14. What are the numbers in the data set? а. 7, 9, 9, 11, 14 b. 7,7,9, 11, 14 c. 7,7,9, 9, 14 d. 7,9, 9, 14, 14 The marks on a statistics test are normally distributed with a mean of 62 and a variance of 225. If the instructor wishes to assign B's or higher to the top 30% of the students in the class, what mark is required to get a B or higher? a. 74.62 b. 71.53 c. 68.74 d. 69.52

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