Question

1. you took 5 tests. four of them are in the 80s and 90s, but one test is a 40%. if your teacher drops the 40%, your overall test mean will

options: increase, decrease, stay the same

Explanation:

Step1: Assume scores for 4 tests

Let 4 tests be 80, 90, 85, 95 (all ≥80). Sum: $80+90+85+95=350$

Step2: Add 40% test, calculate mean change

Total tests = 5. New sum: $350 + 40 = 390$. Original mean (4 tests): $\frac{350}{4}=87.5$. New mean: $\frac{390}{5}=78$.

Step3: Compare means

78 < 87.5 → mean decreases.

Answer:

Decrease