1. mean number read by Ethan is (39+ 60 + 29 + 29 + 45) / 5 = 202/5 = 40.4
2. Mean number by Daniel = (34 + 29 + 54 + 43 + 24) = 184 / 5 = 36.8
Enter the equation in which you got the decimal into your TI-84 calculator. Then press the math button. After, select Frac, which stands for fraction. Then press “enter” twice.
Answer:
-2.8
Step-by-step explanation:
Given that:
Mean, μ = 78
Standard deviation, σ = 5
Omar's score, x = 64
The Zscore of Omar's score :
Zscore = (x - μ) ÷ σ
Zscore = (64 - 78) / 5
Zscore = - 14 / 5
Zscore = - 2.8
Hence, Omar's exam score is - 2.8
