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Average and Mixture Allegation

1. David obtained 76, 65, 82, 67 and 85 marks (out of 100) in Englis, !atemati"s,

#$si"s, %emistr$ and biolog$. &at are is average marks'

a. 65 b. 6 ". 76 d. 72

e. one of tese

2. *n +runs o-inion, is eigt is greater tan 65 kg, but less tan 72 kg. /is broter

does not agree it +run and e tinks tat +runs eigt is greater tan 60 kg

but less tan 70 kg. /is moters vie is tat is eigt "annot be greater tan 68

kg. *f all of tem are "orre"t in teir estimation, at is te average of different

-robabl$ eigts of +run'

a. 67 kg b. 68 kg ". 6 kg d. Data

inadeuate

e. one of tese

. e average of 20 numbers is 3ero. 4f tem, at te most, o man$ ma$ be

greater tan 3ero'

a. 0 b. 1 ". 10 d. 1

. ind te average of all te numbers beteen 6 and i" are divisible b$ 5.

a. 18 b. 20 ". 2 d. 0

5. e average of first five multi-le of is

a. b. ". 12 d. 15

6. e average of te first nine -rime numbers is

a. b. 11 ".9

111 d.

9

211

7. + student as asked to find te aritmeti" mean of te numbers , 11, 7, , 15

1, 8, 1, 17, 21, 1 and . /e found te mean to be 12. &at sould be te

number in -la"e of '

a. b. 7 ". 17 d. 1

8. e average of 2, 7, 6 and is 5 and te average of 18, 1, 6, and $ is 10. &at iste value of $'

a. 5 b. 10 ". 20 d. 0

. *f te mean of 5 observations , 9 2, 9 , 9 6 and 9 8 is 11, ten te mean

of te last tree observations is

a. 11 b. 1 ". 15 d. 17

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10. *f te mean of a, b, " is ! and ab 9 b" 9 "a : 0, ten te mean of :,, 222 iscba

a. 2M b. 23M ". 26M d. 29M

11. e average of te to;digit numbers, i" remain te same en te digits

inter"ange teir -ositions, is

a. b. ". 55 d. 66

12. e average of first 50 natural numbers isa. 12.25 b. 21.25 ". 25 d. 25.5

1. e mean of 12, 22, 2, 2, 52, 62, 72is

a. 10 b. 20 ". 0 d. 0

1. e average of all odd numbers u-to 100 is

a. b. .5 ". 50 d. 51

15. *f a, b, ", d, e are five "onse"utive odd numbers, teir average is

a. ( )45 +a b. 5

abcde

". ( )edcba ++++5

d. one of tese

16. *n at ratio must a gro"er mi to varieties of -ulses "osting