Question: In a math test, there were 20 questions of three levels: easy questions (2 points), medium questions (3 points), and hard questions (5 points). The total score of all questions was 70 points. The total score of all medium questions and the total score of all easy questions were in the ratio of 9 : 1.
Tai correctly answered all easy questions, half of the medium questions and two-third of the hard questions. How many points did he score in total? Show your work.

Needmax 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.