For a population with a mean of u=72 and a standard deviation of o=10 what is the standard error of the distribution of sample means for each of the following sample sizes

For a sample of n=4
oM=

For a sample of n=25 scores
oM=

Icould really use some with this question.

Which table shows a proportional relationship between miles traveled and gas used?

Desmond wants to sell his car that he paid $8,000 for 2 years ago. the car depreciated, or decreased in value, at a constant rate each month over a 2-year period. if x represents the monthly depreciation amount, which expression shows how much desmond can sell his car for today? \ 8,000 + 24x 8,000 - 24x 8,000 + 2x 8,000 - 2x