SOLUTION: If the mean height of bonsai trees is 52 cm with a standard deviation of 10 cm, 95% of the trees are between ______ and _______.
-115
-70
-65
-125
-85
-130
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Question 1202984: If the mean height of bonsai trees is 52 cm with a standard deviation of 10 cm, 95% of the trees are between ______ and _______.
-115
-70
-65
-125
-85
-130
Answer by Theo(13342) (Show Source): You can put this solution on YOUR website!
critical z-score is plus or minus 1.96.
z = (x-m)/s
z is the z-score
x is the raw score
m is the mean
s is the standad deviation
when z = 1.96 and s = 10 and m = 52, formula becomes 1.96 = (x-52)/10.
solve for x to get x = 1.96 * 10 + 52 = 71.6.
when z = -1.96 and s = 10 and m = 52, formula becomes -1.96 = (x-52)/10.
solve for x to get x = -1.96 * 10 + 52 = 32.4.
critical x-score is 52 plus or minus 19.6 = between 32.4 and 71.6
i don't see any of your selections matching that.
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