Answer to Question #293357 in Statistics and Probability for abeni

Question

6. Given a set of n numbers which of the following is not changed by adding a

non-zero constant to each of the numbers.

A. the median                     B.the mid-range

C.the arithmetic mean      D.the standard devation

7. From the following which is the best measure of dispersion?

A. Range                         B. standard devation

C. Quartile devation      D. The 10-90 percentile range

8. Suppose the mean score of 35 students in an exam of a course was found to be 76. But later on it is discovered that the scores of two students 84 and 93 was misread as 48 and 39. Then the correct mean was (in one decimal place)

A. 78.6          B. 73.4       C. 74.0    D. 81.1

Answer 1

6. D. the standard deviation

7. B. standard deviation

8.

$$\dfrac{76(35)-48-39+84+93}{35}\approx78.6$$

A. 78.6