Question

Do
8.3. (a) A die is rolled five times and a 5 or 6's considered a success
Find the probability of (i) no success, (ii) at least 2 successes,
(ii) at least one but not more than ccesses.
(B.Z.U., B.A/B.Sc. 1986)
(b) Using the binomial distribution, find the probability of
3 successes in 8 trials when p = 0.4,
2 failures in 6 trials when p = 0.6, allt
2 or fewer successes in 9 trials when
100​

Answer 1

Answer:

Answer

Correct option is

A

4

Let p be the probability of success in a single throw of die

p=

6

2

=

3

1

q=1−

3

1

=

3

2

Given, n=8

Mean = np=

3

8

=2.67

Standard Deviation =

npq

=

8×

3

1

×

3

2

=

3

4

=1.33

Mean + Standard Deviation =2.67+1.33=4

Answer 2

Step-by-step explanation:

n=5

5 and 6 consider as success

1'2)1,3 1,4 1,5 1,,6