Question

Last summers, students who worked earned an average of $80 a week with a standard deviation of $12. What percentage of students earned more that $104 per week?

Answer 1

Answer:

• 2.28%

Step-by-step explanation:

Given:

• μ = 80
• σ = 12
• x = 104

Find z-score:

• z = (x - μ)/σ
• z = (104 - 80)/12 = 2

Percent value corresponding to 2 as per z-table is 0.9772. This is corresponding to 97.72%.

Percentage of students earned more than $104:

• 100 - 97.72 = 2.28