Question1:(5+5+8+9)/(5+5+8+9+5+4+3+2) = 66%.
Second question: 72 * * 3 people, 73 * * 2 people, (3-2)/2=50%.
Question 3: Median: (5+5+8+9+5+4+3+2)/2=20.5, then the median is the 20th number, that is, (69+69)/2=69.
Average value: (66 * 5+67 * 5+68 * 8+69 * 9+70 * 5+71* 4+72 * 3+73 * 2)/(5+5+8+9+5+4+3+2) =
Step 2 Sort from small to large
3.38 3.49 3.57 3.64 3.69 3.85 3.85 3.89 3.89 3.89 3.90 4.02
Median: 3.85
Average value: Add all the numbers and divide by 12 ... Press the calculator. ....
The average can better express the result of this long jump.
Step 3 Sort from small to large
1.2 6.8 30 60 75 86 98 1 10 125 364
Median: (75+86)/2=90.5.
Average value: Add all the numbers and divide by 10 ... Press the calculator. ....
It is more appropriate to use the average value.
Note: average algorithm, all figures are added and divided by the total.
Median algorithm: sorting from small to large, the middle number, if this array is an even sequence, is the sum of the middle two numbers divided by 2.