Wednesday, 21 June 2017
Wednesday, 14 June 2017
Thursday, 8 June 2017
Mean, Median, Mode, and Range
Statistics name: Anna
WALT- Identify the mean, median and mode within a collection of data
Activity One
Answer the questions in a different colour
The definition of the mean in a statistical investigation is commonly referred to as the average. It is the total of all the data divided by the amount of data shown.
For example: if we have this range of data 3,5,7,1,2,3,6,8
3+5+7+1+2+3+6+5 = 32 = 4
8 8
- Find the mean in this set of numbers
3,7,8,4,2,6,5,4,3,9 = 51 ➗ 10 = 5 r 1
- Find the mean in the set of numbers
4,12,5,6,11,9,5 = 52 ➗ 7 = 7. r 3
- Find the mean in this tally chart
Pets owned by students
|
Number of students
|
Dogs
|
IIIII IIIII
|
Cats
|
IIIII IIIII II
|
Fish
|
IIII
|
Rabbits
|
II
|
- Find the mean in this set of numbers
24,12,16,18 = 70 ➗ 4 = 17.r 2
- Find the mean in this set of numbers
5,9,12,4,10,7 = 47 ➗ 6 = 7. r 5
- CHALLENGE QUESTION: Find the mean within this data, use the frequency table to help you
1,5,5,2,1,2,5,5,5,5,1,2,1,5,5 = 50 ➗ 15 = 3 r 5
Score
|
Frequency
|
1
|
4
|
2
|
3
|
5
|
8
|
Total
|
15
|
Activity Two
Answer the questions in a different colour
The definition of the median is the middle number within a set of numbers that have been put in order from size (biggest to smallest or smallest to biggest)
For example: 2,6,4,1,9 = 1,2,4,6,9 and the middle number is 4.
BUT say if there is more than one middle number… the median is found by taking the number midway between the middle pair of numbers:
3,6,1,4,9,2 = 1,2,3,4,6,9 → 3 + 4 = 3.5
2
Find the median in these sets of numbers
- 10,14,17,12,19,11,16 = 14
10,11, 12, 14,16,17,19 = 14 is the middle number
- 34,42,37,31,40 = 37
31, 34, 37,40,42 = 37 is the middle number
- 101, 167,138,124,198,149 = 143.5
101, 124, 138,149, 167, 198 = 143.5 is the middle number
- 54, 58,52,57,53,60 = 55.5
52, 53, 54,57,58,60= 55.5 is the middle number
- 1001, 1094, 1023, 1065, 1038, 1027, 1042 = 1038
1001, 1023, 1027, 1038, 1042, 1065, 1094 = 1038 is the middle number
- Find the median within this tally chart
Pets owned by students
|
Number of students
|
Dogs
|
IIIII IIIII
|
Cats
|
IIIII II
|
Fish
|
IIII
|
Rabbits
|
IIIII III
|
Hamsters
|
II
|
10, 12,4, 8, 2 = 8
2,4, 8, 10,12 = 8 is the middle number
Activity Three
The mode is the most frequent number in a set of data. The number that occurs most often.
For example: In a set of numbers 3, 7, 8, 4, 2, 6, 5, 4, 3, 9 there is two modes, 3 and 4 because they appear twice in the data set.
Note- There can either be 0, 1 or 2 modes. If there are 3 or more numbers occur the same number of times, there is no mode.
Find the mode in these sets of numbers
- 2, 1, 5, 3, 7, 8, 5, 3 ,9 = 3 and 5
- 1, 5, 3, 2, 9 ,4, 1, 6, 8, 0 = 1
- 23, 45, 78, 12, 45, 67, 32, 46, 93, 12 = 12
- 101, 121, 123, 145, 167, 121, 139, 145, 176 = 121
- 394, 273, 219, 294, 183, 291, 273, 288, 271 = 273
RANGE:
- 32, 41,37, 34, 40 = 41 - 32 = 9
- 100, 92,96,94,98 = 100 - 92 = 8
- 72, 79, 76,74,69,80 = 80 - 69 = 11
- 54, 57, 52, 55, 58 = 58 - 52 = 6
- 112, 125, 115, 111, 120 = 125 - 111 = 14
Thursday, 1 June 2017
My IKAN Test Results
In Room 3 maths class, we completed another IKAN test. When we first did our IKAN test it was so hard because it was way too fast. We had all work off one big screen at the front of the room.
We were very overwhelmed and so scared we were going to get all the answers wrong.
This time around we got to do our IKAN test on our own netbooks and given our own earphones. We got to listen to it two times. I felt this was easier to do.
I was very disappointed because my answers were not all correct. I got most answers right which is the good news. We got to mark our answers ourselves and I would say that was really fun because we got to circle our silly mistakes that we knew but we weren't thinking hard enough and we got to mark that right.
But I was kinda mad but I hope we do this again so I can try harder to get my answers right.
Subscribe to:
Posts (Atom)