# Probability question

1. Sep 1, 2008

### B2k

jus before i go back to college trying to get a bit of revision done..
however i seem to have a block on this probability question...

a company makes tablets.. 94% would pass a disintegration test.. an inspector selects 6 at random at least 4 would have to pass, what is the proability of passing this test..?

and.. a study is conducted with 8 people tasting two products.. one with an additive.. 6 people select as product one having the additive.. can people tell a difference? use probabilty to justify your answer.. just wondering how best to prove that statement?

2. Sep 1, 2008

What have you tried for each one?

3. Sep 1, 2008

### B2k

well for the second part its obvious that people can tell a difference if 6 can identify it.. thats just a straightforward probability q that can be done with the formula p=a/s.. i can do the math for that.. just how to phrase it..

the first part, im a bit stumped.. the answers i get seem far out.. im not sure am i using the % part of it right..

4. Sep 1, 2008

### tiny-tim

Welcome to PF!

Hi B2k! Welcome to PF!
So show us what you've done …

5. Sep 1, 2008

### Ygggdrasil

Here's how I would approach #2. Consider what happens if people CANNOT tell the difference between the two products and just choose randomly. What is the probability that 6/8 choose the correct product?

6. Sep 1, 2008