Jiayang's answer to Pikachu's International Baccalaureatte Further Maths HL question.

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Jiayang
Jiayang's answer
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Pikachu
Pikachu
1 year ago
For b)Y is it 0.98810?We have do like this right?
1-P(X>=8)
1-0.0866
=0.9134

Am i right?Frm the poisson table we have ro find the mean 4.5 and 8 right?
Jiayang
Jiayang
1 year ago
Yes it's right. Fewer than 8 means fewer or equals to 7. So just do p(y<= u). Since possion is discrete you can't any value between 7 and 8. Idk about the table, never used it before.
Pikachu
Pikachu
1 year ago
Ohhh...okok....got it