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.

answer

a,b, and d

explanation

a reflection angle is more than

but less than;

an angle that measures

is a reflex angle.(true)

an angle that measures less than

is acute.(true)

provided we are considering angles greater or equal to zero.

an acute angle lies in the range.

an obtuse angle is less than 180° but more than 90°

an angle that measures 300° is obtuse (false)

an angle that measures 65° is an acute angle.(true)

i can you with this sweetie!

step-by-step explanation: