In a bag of keys, there are 15 silver keys, 5 black keys, 11 copper keys, and 4 painted keys of various colors. one key is drawn out at random. what is the probability that the key that is drawn is silver or copper?

Solve 3x-18=2y and 5x-6y=6 by elimination show work

Cor d? ? me ? 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.

Jane’s favorite fruit punch consists of pear, pineapple, and plum juices in the ratio 5: 2: 3. how many cups of pear juice should she use to make 20 cups of punch?