username1533709
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#1
Report Thread starter 6 years ago
#1
Question 7 part ii.
http://www.ocr.org.uk/Images/86966-q...atistics-1.pdf
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brianeverit
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#2
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Did you getr 56 for npart (i) ?
If so, find the number of selections that include P, either by assuming that P is selected and then selecting 2 from the remaioning 7 letters, or by finding the number that do not include P and subtracting from 56. Probability of selecting P is number of selections including P divided by total possible number of selections.
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C0balt
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#3
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Simple way to think about it
The probability of getting P is 1/8
There are three ways in which this can be achieved as you can pick P first time, or second time, or third time

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Andy98
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#4
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I'd say binomial probability where n=3 and p=0.125
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