Question
There is a list of 110 songs that are given to me by a potential friend....
There is a list of 110 songs that are given to me by a potential friend. She says that I should mark each song with whether I love it or not. Of these 110 songs, I mark 45 as "Love". Step 2 of 2: For the event discussed in the previous step, would it be unusual? Explain your reasoning.
Homework Answers
Answer #1
Assumption: You are equally like to mark a song as 'love' and 'don't love'
That is, P(love), p = 0.5
Number of songs, n = 110
Mean number of songs you expect to love = np
= 110 x 0.5
= 55
Standard deviation of number of songs you love = 
= 
= 5.244
A value is considered usual if it is within 2 standard deviations of mean
Usual number of songs you love = 55 
5.244
= 44.5 to 65.5
45 lies in the interval that is considered usual. Therefore, the event would not be considered unusual.
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