SOLUTION: The following distribution of marks has mean 5.5 Mark 1 2 3 4 5 6 7 Frequency 2 4 6 9 x 9 4

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Question 1153914: The following distribution of marks has mean 5.5
Mark 1 2 3 4 5 6 7
Frequency 2 4 6 9 x 9 4

Found 2 solutions by greenestamps, ikleyn:
Answer by greenestamps(13203) About Me  (Show Source):
You can put this solution on YOUR website!




%28146%2B5x%29%2F%2834%2Bx%29+=+5.5

146%2B5x+=+187%2B5.5x

-41+=+.5x

x+=+-82

Obviously the data is bad....

Looking at the data for marks 1-4 and 6-7, the mean is

= 4.29 approximately.

You can't add marks of 5 to a mean of 4.29 and end up with a mean of 5.5.

Answer by ikleyn(52817) About Me  (Show Source):
You can put this solution on YOUR website!
.

When a post comes to the forum with no question  (as the given post does),

such post  DOES  NOT  DESERVE  any consideration,  at all.


What it really deserves,  is a  PENALTY.