Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

You are not logged in.

|
Options

kempos
2006-01-19 15:38:09

1. P = (e^(-7)* 7^2)/2! = 0.02234121335

where 7 is expeted number of occurences and two the number of occurences we want to get.

2. P(0) + P(1) + P(2)

But I'm really not sure. Hope some guys here will be able to help you with this problem.

ryos
2006-01-19 13:22:28

Poisson? Isn't that french for "fish"?

Sorry, I don't have anything helpful to say.

sandra
2006-01-19 11:31:12

i need some help on the following question......

The probability that a glass fiber will shatter during an experiment is believed to follow a poisson distribution. In certain apparatus, it was found that, on average, 7 glass fibers shattered. Determine the probability that, during a single demonstartion of the experiment,

i) two glass fibres will shatter

ii) at most two glass fibres will shatter

im finding it really difficult.

Thank you