Question
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Answer
Mean:
Variance:
Solution
To find the mean and variance of a binomial distribution, we can use the formulas:
Mean:
Variance:
Variance:
Given:
Let’s calculate the mean and variance using the formulas.
Calculate the value by following steps:
Calculate the value by following steps:
- step0: Calculate:
- step1: Multiply the numbers:
The mean of the binomial distribution is.
Now, let’s calculate the variance.
Calculate the value by following steps:
Calculate the value by following steps:
- step0: Calculate:
- step1: Subtract the numbers:
- step2: Multiply the numbers:
- step3: Multiply the fractions:
- step4: Multiply:
The variance of the binomial distribution is.
Therefore, the mean is
and the variance is
.
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Bonus Knowledge
To find the mean and variance for a binomial distribution given
and
, you can use the formulas for mean
and variance
.
-
The mean
is calculated as: Now, to express it as, we find : -
The variance
is calculated using: Therefore, your answers are: