Answer according to Swikness theorm. Thank you Illustration : The mean and standard deviation of a set of 100 observations were 40 and 5 respectively by a computer which by mistake took the value 50 in worked out as place of 40 for one observation. Find the correct mean and

Please answer B, C, & D.

Many students did an exam, the mean was 15 and the standard deviation was 32 The highest mark was X= 103, What is the zscore of the highest mark?

On a nationwide math test, the mean was 60 and the standard deviation was 7. If Roberto scored 85, what was his z-score?

Please be sure answers are correct.

On a verbal skill test, the mean was 72 and the standard deviation was 7. If John scored 75, what was his z-score?

The distribution of the scores on a standardized exam is approximately normal with mean 400 and standard deviation 35. Between what two values do the middle 50% of scores lie? Round to the nearest whole number. Write you answers with comma between them.

Solve this question for me please.

You want to know the percentage of utility companies that earned revenue greater than 94 million dollars. If the mean revenue was 60 million dollars and the data has a standard deviation of 15 million, find the percentage. Assume that the distribution is normal. Round your answer to the nearest hundredth.

Please answer a and b