# Math Help - Probability question

1. ## Probability question

i can not figure out since i don't know it's normally distributed or not?

2. You can do a test for normality but you need the raw data which in this case looks unavailable.

What impact would the C.L.T. have in this question?

Have you thought to use a different distribution i.e. binomial?

3. Originally Posted by pickslides
You can do a test for normality but you need the raw data which in this case looks unavailable.

What impact would the C.L.T. have in this question?

Have you thought to use a different distribution i.e. binomial?
i did solve part b) using binomial theorem and i got the answer of 0.9713

but in part a) i can not use binomial since np is less than 5.

4. Originally Posted by Jattboyz
i did solve part b) using binomial theorem and i got the answer of 0.9713

but in part a) i can not use binomial since np is less than 5.

"if" you are using the binomial approximation to the Normal.
For part (a) you have the 2-day probability figure...

$(p+q)^5=\binom{5}{5}p^5+\binom{5}{4}p^4q+.....$

The probability that all 5 are returned by Monday is $p^5=0.8^5$