Exampie 13.15) Five coins are tossed 3,200 times and the number of heads appearing each time is noted. At the end, the following results were obtained: Number of heads 2 3 4 Frequencies 80 570 1100 900 500 50 Use chi-square test of goodness-of-fit to determine whether the coins are unbiased. Use 5 per cent level of significance.

Each student in a statistics class was asked to randomly select a number from 1 to 10. The graph below summarizes their choices. The height of the bar above a number indicates the percentage of students in the class that chose that number (the actual percentage is shown above the bar). A) what is the median of all the numbers selected by the students? B) what is the first quartile Q1 of all the numbers selected by the students? What is the third quartile Q3 of all the numbers selected by the students?

Mean 170 standard deviation 5 we find the heights of 80 people . a) how many would you expect to be between 165 and 175 cm tall? b) how many would you expect to be  taller than 166cm?

90%