4. Mean and Standard Deviation A researcher conducts an observational study, then uses the methods of this section to find that the mean is 5.0 while the standard deviation is -2.0. What is wrong with these results?

Finding u, , and Unusual Values. In Exercises 5–8, assume that a procedure yields a binomial distribution with n trials and the probability of success for one trial is p. Use the given values of n and p to find the mean and standard deviation . Also, use the range rule of thumb to find the minimum usual value and the maximum usual value

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5. n  200, p  0.4 6. n  60, p  0.25 7. n  1492, p 1 4 8. n  1068, p 2 3