The entrance exam for business schools, the GMAT, given to 100 students had a mean of 520 and a standard deviation of 120. What was the standard error for the mean of this sample of students?

Answer :

Given :

The population mean (μ)=520

The population standard deviation (σ)=120

The sample size (n)=100

Solution :

σx¯=σn =120100 =12

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