# in 2014, 85 percent of households in the united states had a computer. for a randomly selected sample of 200 households in 2014, l

in 2014, 85 percent of households in the united states had a computer. for a randomly selected sample of 200 households in 2014, let the random variable cc represent the number of households in the sample that had a computer. what are the mean and standard deviation of cc ?

### 1 thought on “in 2014, 85 percent of households in the united states had a computer. for a randomly selected sample of 200 households in 2014, l”

1. minhkhang
The standard deviation is 5.05 households, while the mean is 170 households.

### What is mean?

The sum of all values divided by the total number of values determines the mean (also known as the arithmetic mean, which differs from the geometric mean) of a dataset. The term “average” is frequently used to describe this measure of central tendency.

### What is standard deviation?

The standard deviation is a statistic that expresses how much variance or dispersion there is in a group of numbers. While a high standard deviation suggests that the values are dispersed throughout a larger range, a low standard deviation suggests that the values tend to be near to the established mean.
Here,
n=200
p=85%
mean=200*85%
=170
standard deviation=√(np(100-p))
=√(170*(100-85))
=√(170*15%)
=25.5
=5.0497
=5.05
The mean is 170 households, and the standard deviation is 5.05 households.
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