Answer:
 the skater needs to get a score of 97 [or more ]
Explanation:
[ 83 + 88 + 92 + M ] / 4 ≥ 90 multiply both sides by 4 
 
 
 
83 + 88 + 92 + M ≥ 360 simplify 
 
 
 
263 + M ≥ 360 subtract 263 from both sides 
 
 
 
M ≥ 97 → the skater needs to get a score of 97 [or more ]