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Consider the given probability histogram of a binomial random variable.

Binomial Random Variable [tex]$(n=6, p=0.9)$[/tex]

What are the center and shape of the distribution?

A. Center: 5.4, Shape: skewed right

B. Center: 5.4, Shape: skewed left

C. Center: 6, Shape: skewed left

D. Center: 6, Shape: approximately Normal


Sagot :

To solve this question, we need to understand the characteristics of a binomial distribution given specific parameters. The parameters of the binomial distribution provided are [tex]\( n = 6 \)[/tex] (number of trials) and [tex]\( p = 0.9 \)[/tex] (probability of success on each trial).

### Step-by-Step Solution:
1. Determine the Center of the Distribution:

The center of a binomial distribution, also known as the mean ([tex]\(\mu\)[/tex]), is calculated using the formula:
[tex]\[ \mu = n \times p \][/tex]
Here, [tex]\( n = 6 \)[/tex] and [tex]\( p = 0.9 \)[/tex].

Plugging in the values:
[tex]\[ \mu = 6 \times 0.9 = 5.4 \][/tex]

Therefore, the center of the distribution is [tex]\( 5.4 \)[/tex].

2. Determine the Shape of the Distribution:

The shape of a binomial distribution depends on the values of [tex]\( p \)[/tex] and [tex]\( (1 - p) \)[/tex]:
- When [tex]\( p = 0.5 \)[/tex], the distribution is approximately symmetric.
- When [tex]\( p \)[/tex] is significantly greater than [tex]\( 0.5 \)[/tex], the distribution tends to be skewed left (more to the right).
- When [tex]\( p \)[/tex] is significantly less than [tex]\( 0.5 \)[/tex], the distribution tends to be skewed right (more to the left).

In this case, [tex]\( p = 0.9 \)[/tex] means the probability of success is very high, and the probability of failure [tex]\( (1 - p) = 0.1 \)[/tex] is very low.

This leads to a situation where most of the outcomes are clustered towards the higher number of successes, resulting in a distribution that is skewed left.

Combining these observations:
- The center (mean) of the distribution is [tex]\( 5.4 \)[/tex].
- The shape of the distribution is skewed left.

Thus, the correct answer is:
```
Center: 5.4
Shape: skewed left
```