Why is it important to check the 10% condition before calculating probabilities involving x –? select one:

a) to reduce the variability of the sampling distribution of x –.
b) to ensure that the distribution of x – is approximately normal.
c) to ensure that we can generalize the results to a larger population.
d) to ensure that x – will be an unbiased estimator of m.
e) to ensure that the observations in the sample are close to independent.

I’d say letter a..

Okay so for every triangle has three angles that always add up to 180 degrees. and to tell the difference between whether they are secure, right or obtuse is that acute: has one angle that is less than 90 degrees. right triangle means there is at least one angle that is exactly 90 degrees. and an obtuse angle has an angle that is bigger than 180 degrees. i’ll do #13 as an example: 13. 40 and 50 so if every triangle has 180 degrees 40+50= 90 degrees then180-90= 90 degrees so the third angle is 90 degrees and because this triangle has a 90 degree angle it means it is a right triangle