Answer: Question not very clear
Step-by-step explanation:
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Answer: B. 4
Step-by-step explanation:
STEP 1
Mean =

STEP 2
Subtract the mean from each data value then square the answer

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STEP 3
Add the squared answers in STEP 2 then find the mean

STEP 4
Square root the answer in STEP 3

Standard deviation is 236.5