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69 math problems
1, the total number of elderly people: 5+5+8+9+5+4+3+2=4 1.

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.