Be a population with probability function f(X;μ,δ²) from which a random sample of size n is selected. Then the distribution of the sample mean tends to the normal distribution with mean μ and variance δ²/n when the sample size tends to infinity.

As a rule, a sample of size greater than or equal to 30 is considered sufficient to apply the theorem and use the approximation.

X[bar]≈N(μ;σ²/n)

If the variable of interest is X: the number of accidents per week at a hazardous intersection.

There is no information about the distribution of this variable, but a sample of n= 52 weeks was taken, and since the sample is large enough you can approximate the distribution of the sample mean to normal. With population mean μ= 2.2 and standard deviation σ/√n= 1.1/√52= 0.15

I hope it helps!

5 0

2 years ago

a farmer grows 128 red tomato plant produces about 32 tomatoes. the farmer plans to sell each tomato for 2.00. explain how to fi

pychu [463]

a farmer grows 128 red tomato plant produces about 32 tomatoes

Each tomato plant produces 32 tomatoes

Total number of tomatoes produced = 128 * 32 =4096 tomatoes

the farmer plans to sell each tomato for 2.00.

Each tomato cost = $2

4096 tomatoes cost = 2 * 4096 = $8192

the farmer will earn $8192 if she sells all of the tomatoes

5 0

3 years ago