D1,..,d9 = 0,0,2,2,2,3,4,6,8 //there are 9 values, in ascending order Q2 (median) = d5 = 2 //value in the middle Q1 = (d2+d3) / 2 = (0+2)/2 = 1 (Q1 is middle value of d1,d2,d3,d4, but there is no middle element among four elements, that is why arithmetic mean is taken) Q3 = (d7+d8) / 2 = (4+6)/2 = 5 interquantlie range = IQR = Q3 - Q1 = 5 -1 = 4 answer: 4
There are 60 min per hour. There are 24 hours in one day, so there are 60 times 24= 1,440 minutes in a day. Person A: for 45 minutes per day had a heart rate of 150, and for 1,395 minutes per day had a heart rate of 60. This means that her heart rate totaled (45x150) + (1,395x60) = 90,450 beats per day. Person B: for 1,440 minutes per day had a heart rate of 72 beats per minute. This means that her heart rate totaled (1,440x72) = 103,680 beats per day.
So for 365 days: 365(103,680-90,450)= 4,828,950-this is the number of beats MORE per year of Person B than Person A.