Asked by Jim
A spinner numbered 1 to 50 is spun twice. Find the probability that the total from the two spins is:
a. 51
b.55
a. 51
b.55
Answers
Answered by
Reiny
51
= 1+50
= 2 + 49
...
= 50+1
there are 50 such cases out of 50(50)
so prob = 50/(50*50) = 1/50
55 , the smallest we can start with is 5
55
= 5 + 50
= 6 + 49
..
= 50 + 5 ----> 46 of them
prob = 46/2500 = 23/1250
= 1+50
= 2 + 49
...
= 50+1
there are 50 such cases out of 50(50)
so prob = 50/(50*50) = 1/50
55 , the smallest we can start with is 5
55
= 5 + 50
= 6 + 49
..
= 50 + 5 ----> 46 of them
prob = 46/2500 = 23/1250