May is tornado month in Oklahoma. According to the National Weather Service, on average in May,...
May is tornado month in Oklahoma. According to the National Weather Service, on average in May, the number of tornadoes in Oklahoma is 21.7 tornados. Consider the random variable X the amount of time (in days) until the 10th tornado occurs.HINT: There are 31 days in May. Think about, on average, a tornado occurs every ___ days.
What is the standard deviation of the number of days before the 10th tornado?
Homework Answers
on average, a tornado occurs every 21.7/31=0.7 days
standard deviation of the number of days before the
10th tornado =sqrt(10*0.72) =2.2136 Days (as
it follows gamma distribution with parameter 
=10 and 
=0.7)
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