Statistics – Standard Deviation and Probabilities.
1)Assume x is normally distributed with mean u=15 and
standard deviation 0=3. Use the approximate areas beneath the normal curve, as
discussed in this section, to answer the following questions. Find p(x<_9)
2)Your high school graduating class had 564 members.
Thirty-three percent of these are expected to attend college. The probability
that less than 160 will attend college is
3)In your college campus, 30% of the students use tobacco in
some form. In your statistics class of 40 students, the probability of finding
at least 15 students who use tobacco is
4)Consider an infinite population with a mean of 160 and a standard
deviation of 25. A random sample of size 64 is taken from this population. The
standard deviation of the sample mean equals:
5)If the standard error of the sampling distribution of the
sample proportion is .0337 for samples of size 200, then the population
proportion must be:
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