math- statistics

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If the probability of a dancing lady accepting an initation to dance is 0.18, find the expected number of ladies you would have to ask before one accepts.

I think that the answer is: 1(.18)+2(.18)+3(.18)...7(.18)+8(.18)+9(.18)=8.1

*round answers to three signifcant figures*

  • math- statistics -

    ? The first one could accept. So one.

    What certainty of accepatnce are you seeking? 90Percent? 99 Percent? There is a probability you could ask 50 without getting an acceptance. Your method is not right, but the basic question remains, with what certainity?

  • math- statistics -

    90% i forgot to say that

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