SOLUTION: I am anew student at this mean mode and median I wish you would show me how to find a missing number I got this problem n,8,18,18,3,6,3 mean=9 How do I find n? also this one find

Algebra ->  Number-Line -> SOLUTION: I am anew student at this mean mode and median I wish you would show me how to find a missing number I got this problem n,8,18,18,3,6,3 mean=9 How do I find n? also this one find       Log On


   

Question 62479: I am anew student at this mean mode and median I wish you would show me how to find a missing number I got this problem n,8,18,18,3,6,3 mean=9 How do I find n?
also this one find n 5,17,5,n,5,4 range=14 mean==
Answer by 303795(602) About Me  (Show Source):
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Question 1
Mean+=+Sum+of+scores+%2F+Number+of+scores
You know the number of scores (count them to get 7) and you know the mean is 9.
Rearrange the formula to find the sum of the scores
Sum+of+scores+=+Mean+%2A+Number+of+scores Substitute the Mean and number of scores into the formula to find the sum of the scores.
Sum+of+scores+=+9+%2A+7+=+63 Summing 8,18,18,3,6,3 gives a total of 56 so the missing number must be 7.

Question 2
The Range is found by subtracting the smallest number from the largest. In this case you have two alternatives; n may be the smallest number in the set or the largest.
If n is the smallest then it would be 3 as 17 - 3 = 14. The mean would be 39 / 6 = 6.5
If n is the largest then it would be 18 as 18 - 4 = 14. The mean would be 54 / 6 = 9