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  1. mathematics
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  3. suppose the mean score on the first exam is a 60 o

Suppose the mean score on the first exam is a 60 out of 100. I would...

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Statistics

Suppose the mean score on the first exam is a 60 out of 100. Iwould like to curve the exam to force the mean score to be an 80out of 100. If I added 20 to everyone’s score, would the SD of theexam scores change? How about if I multiplied 4/3 to everyone’sscore? Explain.


Part 2: Continuing from Part 1, fill out the formulas putbelow that will always be true. Let a = constant (- or +) and X =random variable.
EV (a + X) = SD (a + X) = SD (aX) =
EV (aX) = Variance (a + X) = Variance (a + X) =

Answer & Explanation Solved by verified expert
4.3 Ratings (542 Votes)
let scores of student be x before adding 20 to each now after adding 20 it it become X20 let YX20 we know that VarianceaXbVaraXVarb2CovaXb but a and b are    See Answer
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