Related Questions

Three maths classes: X, Y, and Z take an algebra test. The average score of class X is 83. The average score of class Y is 76. The average score of class Z is 85. The average score of class X and Y is 79 and the average score of class Y and Z is 81. What is the average score of the combined classes X, Y, and Z?
A 81
B 81.5
C 82
D 84.5
Three math classes , X, Y , and Z, take an algebra test. The average score in class X is 83. The average score in class Y is 76. The average score in class Z is 85. The average score of all students in classes X and Y together is 79. The average score of all student classes Y and Z together is 81. What is the average for all the three classes?
A 81
B 81.5
C 82
D 84.5
? A players average test score on 4 tests is 78. What must be his score on a 5th test for average score on the test to be
A 82
B 84
C 86
D 88
Babul attended five tests during the semester and the average of his test scores was 87. If has average score after first three tests were 85, what was the average of his 4th and 5th test?
A 88
B 89
C 90
D 93
On Tuesday, 30 of the students in a class took a test and their average score was 83.5 . On Thursday , the other 5 students took the test, and their average score was 94. what was the average for the entire class?
A 83.5%
B 84.5%
C 85%
D 88.2%
On Saturday , 20 of the students in a class took a test and their average score was 80. On Tuesday, the other 5 students took the test, and their average score was 90 . what was the average for the entire class?
A 82
B 84
C 85
D 88
On Tuesday, 30 of the students in a class took a test and their average score was 83.5. On Thursday, the other 5 students took the test, and their average score was 94. What was the average for the entire class?
A 83.5%
B 84.5%
C 85%
D 88.2%
The individual variation between test strength of sample should not be more than
A ±5% of average
B ±10% of average
C ±15% of average
D ±20% of average
A student scored 80 marks in his first test. After taking the third test, his average dropped from 82 to78 . What is the average of his 2nd and 3rd tests ?
A 57
B 76
C 77
D 78
Salam's average in four test is 80%. What mark does she need to score in her fifth test to make her average 84%?
A 100%
B 94%
C 84%
D 96%

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