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A t  table is the students distribution. That is for small sample sizes.
In part c,
Hi;
p(x<15)=p(z< 1519.5 / 2.612 )=p(z<1.7225)=0.50.4573=0.0427
Hi;
excuse me, how can you know p(x<15) in part b? i don't understand why the number is 15
Hi cynthia258; b) P(15 or less agree) = .04248
A statistician conducted a research and the results showed that 65% of bluecollar workers agree that 8 working hours per day is acceptable. A random sample of n bluecollar workers was selected and let X be a random variable defined as the number of bluecollar workers agree the view. 