Challenging statistic question. answer provided

Posted on 2013-11-29 11:44:00 in Statistics by RAMSES

Can someone tell me where X came from with in this stat answer?



A researcher at NYU claims that for Mathematics courses the proportion of grades B or higher was more than 33.0%. In a random sample of 100 grades issued in the year 2006 there were 27 Fs, 15 Ds, 22 Cs, 14 Bs, 22 As. At a=0.10 test the researcher's claim.

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Ho: p=0.33

Ha: p>0.33

Critical value for alpha=10%=1.28

p?=(36/100)



p?=x/n. But how did they get x (36).

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