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.

3< x< 5

step-by-step explanation:

|x - 4| < 1

there are two solutions, one positive and one negative.   remember to flip the inequality when taking the negative solution

x-4 < 1       x-4 > -1

add 4 to each side

x-4+4 < 1+4       x-4+4 > -1+4

x< 5                 x> 3

3< x< 5

the 2 figures are congruent bc if you reflect abcd over the y axis then over the d axis the figures overlap