Question

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Answer 1

Answer:

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Answer 2

Step-by-step explanation:

19. a)6

b) 3

20. Mean of heights of 7 girls= 145

Sum of heights / No. of girls

145 =138+142+147+135 +x / 7

145 = 562+x / 7

562+x = 145 X 7= 888

562+x = 1015

x =1015-562= 453

Height of 3th girl = 453cm

21. we are arrange in descending order,

-3/7= -0.42

-5/12= -0.416

-9/42= -0.214

-11/84= -0.130

Answer- -0.42, -0.416, -0.214, -0.130

22. a) odd number = 4

probability getting on odd number,

4/8= 1/2= 0.5

b) A number greater than 3 and less than 8

{4,5,6,7}= 4

so, 4/8 =1/2=0.5

c) probability of getting factor of 8