Question

. Numbers 1 to 20 are written on twenty separate slips (one number on one slip) kept in a box and mixed well. One
slip is chosen from the box without looking into it. What is the probability of getting
i) Number 7?
ii) A number less than 15?
A number greater than 8?
iv) A 2-digit number?​

Answer 1

Answer:

i)1/20

ii)14/20=7/10

iii)12/20=3/5

iv)11/20

Step-by-step explanation:

Probability=No. of favourable outcomes/Total no. of outcomes

Total no. of outcomes =20

i) favourable outcome=7(1 no. only)

Probability=1/20

ii) favourable outcomes=1,2,3,4,5,6,7,8,9,10,11,12,13,14(14no.)

Probability=14/20=7/10

iii) favourable outcomes= 9,10,11,12,13,14,15,16,17,18, 19,20(12no.)

Probability=12/20=3/5

iv)favourable outcomes=10,11,12,13,14,15,16,17,18,19,20(11 no.)

Probability=11/20