Question: Correct ans is given can someone give explanations ? The sample mean and sample variance of a set data are 10 and 26, respectively. Suppose

Correct ans is given can someone give explanations ?

  1. The sample mean and sample variance of a set data are 10 and 26, respectively. Suppose that each data point is doubled.What is the sample variance of the modified data set? ANS = 104
  2. The sample variance and the sum of squares of five numbers are 36.5 and 391, respectively. What is the sample mean of these five numbers? (Round your answer to the nearest whole number.) Ans = 7
  3. Scores on the SAT verbal test in recent years follow approximately a Normal distribution with mean 523 and standard deviation 107.How high must a student score (rounded to the nearest whole number) in order to place in the top 15% of all students taking the SAT? Ans =634

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