Mr. dennis gave his class a 202020-question multiple choice quiz. the distribution of raw scores had a mean of 151515 and a standard deviation of 2.52.52, point, 5. mr. dennis is going to multiply each raw score by 555 so the quiz is worth a total of 100100100 points. if each score is multiplied by 555, what will be the mean and standard deviation of the distribution of new scores

75,62.5

Step-by-step explanation:

Given that Mr. Dennis gave his class a 20-question multiple choice quiz. The distribution of raw scores had a mean of 15 and a standard deviation of 2.5

If X is the correct questions in the 20 mcq then

X is  with mean = 15 and std dev = 2.5

when score is multiplied by 5

random variable now is

Y = 5x

E(Y) = Mean of Y =

Thus new score out of 100 would have mean = 75 and std deviation = 62.5

take it another

describing distributions is one of the key skills you’ll need to earn a high score on the ap statistics exam. if you need proof of this, just flip through some past exam questions, which can be found at the collegeboard website. you’ll notice that the first free response question is almost always a question requiring you to look at a graph and describe it.

step-by-step explanation: just trying to get points sorry : (