A die is thrown twice. If getting a number greater than four on the die is considered a success, then the…

A die is thrown twice. If getting a number greater than four on the die is considered a success, then the variance of the probability distribution of the number of successes is
  1. 23
  2. 13
  3. 49
  4. 89

Solution

The numbers that are greater than 4 on the die is 5, 6.

The probability of successes is,

p=26=13

Now, the variance of probability distribution,

σ2=npq

=2×13×23

=49

Asked in: AP EAMCET 2019 (21 Apr Shift 2)

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