# S1 Help !

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#1
Question 7 part ii.
http://www.ocr.org.uk/Images/86966-q...atistics-1.pdf
0
6 years ago
#2
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.
0
6 years ago
#3
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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0
6 years ago
#4
I'd say binomial probability where n=3 and p=0.125
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