Using the information below, answer the questions that follow.
Miss Bridget teaches in a small learning support class. The follow are the data from a recent math assessment from three of her students: 84, 80, 74.
-What is the standard deviation?
A) 4.11
B) 10
C) 79.33
D) 16.8889

Question

Quizplus · Accepted Answer

To calculate standard deviation, we first need to find the mean of the data set. Adding the three scores together and dividing by three gives a mean of 79.33. Next, we need to find the variance by subtracting each score from the mean, squaring the difference, adding up the squared differences, and dividing by the number of scores minus one. This gives a variance of 33.33. Finally, the standard deviation is found by taking the square root of the variance, which is approximately 4.11. Therefore, the answer is A) 4.11.

Using the Information Below, Answer the Questions That Follow