If a sample of 69 students is taken from a population of 508 students, the

population variance, o> , is the variance of how many students' heights?

Step-by-step explanation:

It must be 508 students heights, because the problem is asking for a population variance, not a sample variance, which is calculated with a different formula.

Remember that population is the total number of subjects that are being studied, and sample is a subgroup of that total number.

last option

step-by-step explanation:

given that δdef is right and isoceles,

assuming that side df is the hypotenuse means that de an ef are the other 2 sides that intersect at 90° and are of equal length.

because they are of equal length, we can say that they are congruent

because they intersect at 90°, their slopes must be opposite reciprocals.

only the last option satisfies these conditions.