dante’s cell phone company charges $45 per month for unlimited calls and internet use and $0.25 per text message. his last cell
2 answers:
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Solution :
The test is distributed normally with mean of 72.8 and the standard deviation of 7.3
Finding numerical limits for the D grade.
D grade : Scores below the top 80% and above the bottom 10%.
Let the bottom limit for D grade be and the top limit for D grade be
.
First find the bottom numerical limit for a D grade is :
..........(1)
From (1)
= 63.45
≈ 64
Now the top numerical limit for D grade :
..........(2)
From (2)
= 66.668
≈ 67
Therefore, the numerical limit for a D grade is 64 to 67.