# SOLUTION: Z Test question.... A state community is elgible for clothes the mean income per annum is \$3,000 or less. A simple random sample of 100 people was drawn from the place and the mea

Algebra ->  Algebra  -> Probability-and-statistics -> SOLUTION: Z Test question.... A state community is elgible for clothes the mean income per annum is \$3,000 or less. A simple random sample of 100 people was drawn from the place and the mea      Log On

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 Click here to see ALL problems on Probability-and-statistics Question 324439: Z Test question.... A state community is elgible for clothes the mean income per annum is \$3,000 or less. A simple random sample of 100 people was drawn from the place and the mean income is \$2,500. The standard deviation is \$200. Find out the proportion with annual incom between \$2500 or less? This is what I got... 3000-2500/200= 500/200= 2.5(Check the appendix for z at 2.5) I got .4938 and .5-.4938=.0062 when converted to percent I got .62%Answer by Fombitz(13828)   (Show Source): You can put this solution on YOUR website!Your question is confusing. Find out the propoetion with annual income between \$2500 and less. Did you mean \$2500 and less? If so why did you use \$3000 to calculate the z score? . . . Also, if z=2.5, then P=0.5+0.4938=0.9938, add, don't subtract. So if the mean is \$2500 and std. dev. is \$200, 99.38% of the people make less than \$3000. . . . Please re-post.