Question

On one page of a telephone directory there were 200 phone numbers the frequency distribution of the unit place digit (for example in the number 25828573 the unit place digit is 3) is given in the table:- Digits:-0,1,2,3,4,5,6,7,8,9 Frequency:-22,26,22,22,10,14,28,16,20 Without looking at the page the pencil is placed on one of 20 numbers that is the number is chosen at random what is the probability that the digit in its unit place is:- (1) an odd number. (2) a prime number. (3) a number greater than 4. Class 9

Answer 1

Total frequency=180

1)an odd no.=1,3,5,7,9

total frequency of odd no.=22+22+10+28+20=102

probability=102÷180=0.56

2)a prime no.=2,3,5,7,

total frequency of prime no.=26+22+10+28=86

probability=86÷180=0.47

3)a no. greater than 4=5,6,7,8,9

total frequency of no.=10+14+28+16+20=88

probability=88÷180=0.48

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Answer 2

Step-by-step explanation:

i) 0.56 ii) 0.47 iii) 0.48

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