11) The width of the class in the distribution having class intervals 1-20, 21-40, 41-60 is
12) The arithmetic mean of the following data is
| Class Interval | 0-10 | 10-20 | 20 – 30 | |
| Frequency | 5 | 14 | 6 |
13) If mean = 44 and median = 42, then mode =
14) Which of the following is more consistent?
15) If x= 
then
thenView Answer
C) x2 -x -3 = 0
Explanation:x =
⇒ X =
(x)2 = (√3+x)2 ⇒ x2 = 3+x
x2 – x – 3 = 0
16) log10125 + log108 =
17) The relation a(b + c) = ab + ac is
18) If n is a natural number, then 8n – 3n is always divisible by
19) If √x 
= 31, then x =
= 31, then x =20) If A and B are two sets then
(A-B) ⋂ (B-A) =
(A-B) ⋂ (B-A) =
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