Question

the table shows janisas scores in an archery tournament qualifying event. janisa needs a mean score of 8 to qualify for the archery tournament. how many points does she need on her last arrow to qualify for the tournament? janisa needs total points to have a mean score of 8. janisa has points so far. janisa needs to score points on her last arrow to qualify for the tournament.

janisas scores
10
10
8
8
3
?

Explanation:

Step1: Calculate total points needed

There are 6 scores in total (5 known + 1 unknown). Mean score needed is 8. So total points needed is $8\times6 = 48$.

Step2: Calculate points so far

Add the 5 known scores: $10 + 10+8 + 8+3=39$.

Step3: Calculate score on last arrow

Subtract points so far from total points needed. $48 - 39=9$.

Answer:

Janisa needs 48 total points to have a mean score of 8.
Janisa has 39 points so far.
Janisa needs to score 9 points on her last arrow to qualify for the tournament.