Ken and Mark have some ducks and pigs. When asked how many ducks and pigs they had altogether, Mark said: "There is a total of 17 heads and 42 feet. I have three times as many ducks as pigs." "Yes," replied Ken, "and we both have the same number of pigs." How many ducks does Ken have?

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.