How to get the probability from the mean of a random variable?

  • Thread starter EGD Eric
  • Start date
  • #1
EGD Eric
2
0

Homework Statement


From past experience, a professor knows that the test score of students taking a final examination is a random variable with mean 65.

Give an upper bound on the probability that a student's test score will exceed 75.


Homework Equations



None that I know of.

The Attempt at a Solution


I tried seeing if I could get the standard deviation, in the hopes that I could do something with that, but I don't know how to even get the variance.

I've tried looking at this problem from a bunch of different angles, writing it out, etc.. I'm seriously stuck! Any help or hints would be greatly appreciated!
 

Answers and Replies

  • #2
adoado
72
0
Is this normally distributed?
 
  • #3
EGD Eric
2
0
I think so.
 

Suggested for: How to get the probability from the mean of a random variable?

Replies
5
Views
239
Replies
4
Views
126
Replies
11
Views
456
Replies
9
Views
480
Replies
1
Views
240
Replies
2
Views
365
Replies
2
Views
436
Replies
1
Views
102
Top