Hi, I'm very new to statistics and would like some one to check over the first part of the question i have done as well as some help on the other two parts.
1) could some one please check part a and see if i have the correct answer .
2) For the second part do i have to work out the probability of 6 machines failing then seven and eight etc all the way up to 60 and and the results together, so i will have a page full of calculations?
3) i know i have to calculate Part b first but what exactly does the numbers mean in terms of the machines failing.
Any help would be greatly appreciated.