Hen 430 randomly selected light bulbs were tested in a laboratory, 224 lasted more than 500 hours. find a point estimate of the last more than 500 hours proportion of all light bulbs thata 0.479b 0.343c 0.519d 0.521

By the definition, An observed value of \bar{x} to estimate the mean of population is a point estimate and the statistic \bar{x} is a poiont estimator.

It is given that, "Hen 430 randomly selected light bulbs were tested in a laboratory"

That is, the Random sample size n= 430

The statement given that, "224 lasted more than 500 hours"

So x=224

Now find a point estimate of the last more than 500 hours proportion of all light bulbs:

Thus

This implies that

Thus the answer is D: 0.521.

$3720

step-by-step explanation:

taxable income = $31000

as per the 2018-2019 us tax bracket, the tax rate is 12% for an individual whose taxable income is between $9,526 to $38,700.

so, the tax to be paid by him = 12% of 31000

= 0.12 * 31000     [12% converted to decimal as 0.12]

= $3720

x = 2

step-by-step explanation:

if sr parallel to ba then the sides bc and ac are in proportion, that is

= ← substitute values

= ( cross- multiply )

27x = 6(4x + 1)

27x = 24x + 6 ( subtract 24x from both sides )

3x = 6 ( divide both sides by 3 )

x = 2