Question

If the class-mark and class-size of a class are 6 and 12 respectively, then the upper limit of the class is
a) 12
b) 14
c) 6
d) 7
​with explanation

Answer 1

Step-by-step explanation:

1. let the lower and upper limit be x and y
2. according to question ----
3. x+y/2=6 (class mark) --------(1)
4. y-x=12 (class size) -----------(2)
5. value of x =y-12
6. putting its value in first equation
7. y-12+y/2=6
8. 2y-12=12
9. 2y=34
10. y=17
11. upper limit,=y=17 ans