Question

Noj has the following test scores:

Answer 1

So the test he scored lowest is 69 so discard this score and put x for it average=numbers added together then summ is divided by number of numbers exg average of 2 and 4 and 5 is 2+4+5=11 then 3 numbers so 11/3 is average or aprox 3 and 2/3 so $\frac{76+84+x+74+91}{5}$=average he wants his new average to be at least 82 so $\frac{76+84+x+74+91}{5} \geq 82$ solve $\frac{76+84+x+74+91}{5} \geq 82$ treat as equation first add like terms in top $\frac{325+x}{5} \geq 82$ multiply both sides by 5 to clear fraction 325+x $\geq$ 410 subtract 325 from both sides x $\geq$ 85 he must get $\geq$ 85 to get an average of at least 82