Ashlynn played six rounds of golf. Her scores were 72, 79, 74, 76, 76, and 75. She really wants to have an mean of 75 after her next round of golf. What must she shoot in order to have an mean of 75?

66
75
73
72

Question

Ashlynn played six rounds of golf. Her scores were 72, 79, 74, 76, 76, and 75. She really wants to have an mean of 75 after her next round of golf. What must she shoot in order to have an mean of 75?

66
75
73
72

kropot72 · Answer

Let the seventh score be x. Then we can write the following equation:
$$\frac{72+79+74+76++76+75+x}{7}=75$$
Now you just need to solve for x.
Hint: Multiply both sides of the equation by 7 as a first step.