The mean score on a physics test was 75 points. Amy’s score was 67 points, which was 2 standard deviations below the mean.
1 answer:
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Answer: Choice B)
We have some value m and we're squaring it to get
To undo this and isolate m, we apply the square root to both sides
There are two solutions here. This is similar to how there are two solutions in something like (those two solutions being x = 5 and x = -5). Squaring any negative number leads to a positive result because
negative times negative = positive.