I finished the rest of my homework but this one question is frustrating me and I can't figure it out. someone help please.
The weekly food cost for a family of 4 is normally distributed with a mean $158.29 and a standard deviation of $31.48. What are the low and high weekly food costs for the middle 60% of families from this distribution?
got the answer ! thanks !
low= -.84(31.48) + 158.29= 184.73
high= .84(31.48) +158.29=131.84
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