
(a)
To find:the range of score needed in the last date to get B.
(a)

Answer to Problem 119AYU
The range of marks needed is
Explanation of Solution
Given information:
The first four scores are
Calculation:
Assume that the score in fifth test is
Calculate the average of the scores in all the five tests.
For grade B average should be greater than or equal to
Multiply each side of inequality by
Add
So the minimum score in the fifth test should be
Therefore, the minimum score in the fifth test should be
(b)
To find:
The score needed in the fifth test if it counts double.
(b)

Answer to Problem 119AYU
The score needed in the fifth test if it counts double is
Explanation of Solution
Given information:
The first four scores are
Calculation:
If the fifth test doubles the average calculated in part (a) will be expressed as,
For grade B average should be greater than or equal to
Multiply each side of inequality by
Add
Multiply each part of the inequality by
So the minimum score in the fifth test should be
Therefore, the minimum score in the fifth test should be
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