If an estimator is unbiased, then;
a. the estimator is usually close to the true value.
b. the mean of the estimator is equal to the true value.
c. the mean of the estimator is usually close to the true value.
d. the estimator is equal to the true value.

B

Explanation:

the strict definition of an ubiased estimator says the mean of the estimator is equal to the true value, so if you have the chance to calculate a long number of times, the mean of the estimator in all of those samples will equal to the true value.

it means that an ubiased estimator is specially close to the true value, because in average with a large number of samples, the calculation is made according to the real value

its 2

Explanation:

i took the test and i got this right

looks

you will have $2593.74 in 10 years if you set aside $1,000 at 10%

you will have $9321.91 in 20 years if you set aside $2000 at 8%

you will have $1469.32 in 5 years if you set aside $1000 at 8%

you will have $1296.87 in 10 years if you set aside $500 at 10%

you will have $239.66 in 15 years if you set aside $100 at 6%

you will have $4660.96 in 20 years if you set aside $1000 at 8%