Which of the following statistics contain three unbiased estimators? a. variance, standard deviation, median b. variance, mean, proportion c. mean, median, range d. median, range, standard deviation

Option 'B' is correct.

Step-by-step explanation:

An estimator with zero bias is known as "Unbiased estimator".

Mean is the unbiased estimator as sample mean is always equal to population mean.

Variance is also an unbiased estimator as the expectation of the sample variance 's squared ' is equal to .

So, it ends up with an unbiased estimate of the population variance.

And proportion is completely unbiased estimator.

Hence, option 'B' is correct.

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)

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a