Originally Posted by

**shirel** exercise:

if the die was rolled sixty times, the expected value for the number of times face 5 shows up would be 10.

calculate the probability that it shows up

a) exactly 10 times

b) 10 +/- 1 times (i.e. between 9 and 11)

c) 10 +/- 2 times

d) 10 +/- 5 times

e) 10 +/- 10 times

which range would guarantee a 90 % certainty? 95 % certainty? 99% certainty?

calculations are necessary. but important is the discussion of the results...

can you give me the formula to calculate a) and the one to calculate b c d e..

and how can i calculate the certainty?

can you help me??

thanks for showing me your calculations, thoughts, ideas, explanations, ...