Probability Question

[goulding74]

Hi Everyone,

I'm looking to calculate the probability of the time taken for a specific event.

I have:

The best case scenario which normally takes 30 seconds and happens 90% of the time.

The worst case scenario which normally takes 3 hours and happen the remaining 10% of the time.

What would the calculation be to calculate the average time for these?

Thanks in advance!

 

[katxt]

Find the total time for 90 cases at 30 s and 10 cases at 3 hrs. Then average over the 100 cases.