Question

6. A jar contains 10 balls having numbers from 1-10 on it. What is the probability of drawing
a) ball numbered 5 ?
b) Probability of getting 2 balls that sum upto 10.( eg 4 +6 =10

Answer 1

Answer:

a)1/10

b) 5/10

Step-by-step explanation:

a) Favorable outcomes = 1

Probability = 1/10

b) Favorable Outcomes = 5

Probability = 5/10

10 is he total, hence, it is the denominator

Answer 2

Answer:

a) 1/10

b) 2/5

Step-by-step explanation:

FORMULA :

Probability = (number of favourable outcomes) / (total number of outcomes)

a:-

number of favourable outcomes = 1 (i.e 5)

total number of outcomes = 10 (coz there are 10 balls)

Probability = (number of favourable outcomes) / (total number of outcomes)

           = 1/10

b:-

first we need to find out favourable outcomes.

a pair of two balls, with different numbers, who sum up to 10.

1 - 1+9=10

2 - 2+8=10

3 - 3+7=10

4 - 4+6=10

Hence, favourable outcomes = 4

total number of outcomes = 10

Probability = (number of favourable outcomes) / (total number of outcomes)

           = 4/10 = 2/5

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