Question

interpret mixed representations
question
a teacher put all her students quiz scores up on the dot plot below.
quiz scores
what was the mean quiz score?
answer
attempt 1 out of 10
points

Explanation:

Step1: Count frequencies per score

60:1, 65:2, 70:2, 75:5, 80:1, 85:3, 90:1, 95:4, 100:1

Step2: Calculate total score sum

$60×1 + 65×2 + 70×2 + 75×5 + 80×1 + 85×3 + 90×1 + 95×4 + 100×1 = 1610$

Step3: Calculate total students

$1+2+2+5+1+3+1+4+1=20$

Step4: Compute mean

$\frac{1610}{20}=80.5$

Answer:

80.5