1.

Solve:A) Find the mean of all prime numbers up to 10. (B) Find the mean proportional between 3 and 27. (C) Divide 81 in to three parts in the ratio 2 : 3 : 4 (D) Given below figure shows a pair of parallel lines cut by a transversal. Find the value of a and b, giving reason.

Answer»

ong>Answer:

1.) The all prime NUMBERS upto 30 are 2,3,5,7,11,13,17,19,23,29

sum of these observations=129

Number of their observation=10

Required mean=129÷10=12.9

2.)The mean PROPORTIONAL of 27 and 3 is √27×3=√81=9.

3.)Given ratio=2:3:4

Sum of their ratio=9

1st part=2/9×81=18

2nd part=3/9×81=27

3rd part= 4/9×81=36

4.)Each FIGURE given below shows a pair of parallel lines CUT by a transversal For each case, find a and b, GIVING reasons.



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