Measures of Center and Spread

[dangerousdingo]

I am not really sure how to solve these problems. I would like some help explaining how to solve, with a very simple step by step. A similar problem to this one, with the answers included, so I can work backwards, would be especially helpful.

 

[Deleted member 4993]

I am not really sure how to solve these problems. I would like some help explaining how to solve, with a very simple step by step. A similar problem to this one, with the answers included, so I can work backwards, would be especially helpful.

What does your textbook say. It have some example problems.

The problem is asking you to evaluate functions for given values. You have learned to do that in Algebra classes.

For this problem, first fill out the table.

Where are you exactly stuck?

 

[Dr.Peterson]

I am not really sure how to solve these problems. I would like some help explaining how to solve, with a very simple step by step. A similar problem to this one, with the answers included, so I can work backwards, would be especially helpful.

Just do what it says. First fill in the table; for the first row, \(x-\bar{x}=3-7.4=-4.4\), and \((x-\bar{x})^2=(-4.4)^2=19.36\).

Then evaluate the formula; the summation in the numerator is the last box in the table, the sum of the squares in the right column.

As has been said, your textbook surely has a similar example. If not, find a better textbook.