A local radio station maintains a very popular phone service, which provides callers with current weather reports. The incoming calls have a Poisson distribution with an average of 5 calls for each 15 minute-period. If x = time between calls, then the probability of receiving four or fewer calls in the next 15 minutes is:
a. 0.2341.
b. 0.7659.
c. 0.2636.
d. 0.7364.
e. 0.9502.
Question 2
A sample of size n is selected at random from an infinite population. As n increases, which of the following statements is true?
a. The population standard deviation decreases
b. The standard error of the sample mean decreases
c. The population standard deviation increases
d. The standard error of the sample mean increases
e. The sample mean increases.
Phone charging
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