Standard Deviation Example Sums. The sample standard deviation would tend to be lower than the real standard deviation of the population. How to find the standard deviation of the sum of independent random variables a high school calculus exam is administered to a group of students.
If electricity bills in dollars of 8 houses are 70 82 76 79 83 85 72 77 and mean is 78 then find the standard deviation. Now use the standard deviation formula. Upon grading the exam it was found that the mean score was 95 with a standard deviation of 12.
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S 31 6 9 6 2 2. S u 2 n u n 2 c. How to find the standard deviation of the sum of independent random variables a high school calculus exam is administered to a group of students. Now use the standard deviation formula.
