Question 414071: A class of 50 students obtained the following grades in a statistics course
A 5, B 25, C 15, D5
If one student is selected at random, what is the probability that,
a. the student obtained a B?
b. the student obtained either B or a C?
c. the student did not obtain a D?
d. the student did not obtain a B or C?
I am not sure were to start with this question, do I use the Tree diagram to help me?
Thank you for you help
Lorraine
Answer by ewatrrr(24785)   (Show Source):
You can put this solution on YOUR website!
Hi
A class of 50 students obtained the following grades in a statistics course
"of which" this was the dstribution: A 5, B 25, C 15, D5
one student is selected at random
P(student obtained a B) = 25/50 = 1/2
P(student obtained either B or a C)= 40/50 = 4/5
P(student did not obtain a D)= 45/50 = 9/10
P(student did not obtain a B or C) = 10/50 = 1/5
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