It is known that the population standard deviation of the IQ

It is known that the population standard deviation of the IQ test results is 16. Assuming that we have a random sample of 140, what is the standard error of the average IQ of a sample of this size?

1.35

1.53

4

16

Solution

Standard Error= sd/ Sqrt(n)
Where,
sd = Standard Deviation
n = Sample Size

Standard deviation( sd )=16
Sample Size(n)=140
Standard Error = ( 16/ Sqrt ( 140) )
= 1.35