I need help with statistics homework.?

According to the Federal Communications Commission, 70% of all U.S. households have vcrs. In a

random sample of 15 households, what is the probability that the number of households with vcrs

is between 10 and 12, inclusive?

How do I get the answer using my TI calc?


Thanks! I calculated all three: .2061+ .2186, +1700 = .5947.

The answers I can choose from are


b. 0.2061

c. 0.5948

d. 0.7

maybe my rounding is off a bit??

1 Answer

  • 9 years ago
    Favorite Answer

    You use it to calculate the probability of each of the three cases: 10, 11, and 12 VCRs.

    For each case, use the binomial formula for n = 15; i = 10, 11, 12; p = 0.70

    p = [ n! / (n-i)! i! ] p^i(1-p)^(n-i)

    Can you take it from there?


    It's almost certain that someone has rounded incorrectly. The .0001 difference strongly suggests that "C" is the correct answer.

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