Question 632677
np = 21*0.77 = 16.17


So np = 16.17


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n(1-p) = 21*(1-0.77) = 4.83


So n(1-p) = 4.83 or nq = 4.83 since q = (1-p)


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Since nq = 4.83 is NOT greater than 5, this means that the normal distribution would NOT provide a reasonable approximation


It would only provide a reasonable approximation if BOTH np AND nq are greater than 5.




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