HELPPPPPPP

[Centurion1]

poisson is a formula.

if you could elaborate i would really appreciate it in all seriousness.

[Montmorency]

What is the probability of getting a 50% discount, when a discount is given for 10/50 cards (at least) defective. 10% probability per card of defectiveness.

Sum probabilities of getting 1, 2, 3, 4, 5, 6, 7, 8, or 9 defective cards and subtract from 1. Or sum probabilities of 10, 11, 12...or 50 defective cards.

Use binomial expansion?

General binomial expansion: _nC₀p⁰qⁿ + _nC₁p¹q^n-1 ... + _nC_n-1p^n-1q¹ + _nC_npⁿq⁰

[Centurion1]

havent learned binomial expansion as strange as it may sound. what does the c mean?

[Montmorency]

choose.

You probably saw it as (^p_q). But that notation is ugly.

[Centurion1]

i unfortunately do not understand this at all.

[Centurion1]

is it a zscore problem?