Describe the standard deviation of the following set of data: {1.2, 2.3, 5.2, 6.6, 4.8} The small standard deviation means that the data values are closer to the mean.
The large standard deviation means that the data values are more spread from the mean.
The small standard deviation means all the data values are approximately equal to the mean.
The large standard deviation means the data values are closer to the mean.

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?

Abcd is a square. what is the measure of angle bac

The ratio of the perimeters of two similar triangles is 4: 3. what are the areas of these triangles if the sum of their areas is 130cm2?