Abox contains four red balls and eight black balls. two balls are randomly chosen from the box, and are not
replaced. let event b be choosing a black ball first and event r be choosing a red ball second,
what are the following probabilities?
p(b) =
p(rib) =
p(b, r) =
the probability that the first ball chosen is black and the second ball chosen is red is about
percent

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

Need now max recorded the heights of 500 male humans. he found that the heights were normally distributed around a mean of 177 centimeters. which statements about max’s data must be true? a) the median of max’s data is 250 b) more than half of the data points max recorded were 177 centimeters. c) a data point chosen at random is as likely to be above the mean as it is to be below the mean. d) every height within three standard deviations of the mean is equally likely to be chosen if a data point is selected at random.

What effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.