A math test in ninth grade (3rd grade) on statistics is very beneficial. Thus, this chapter on math statistics is to be mastered and handled with concentration.
This proctored assignment on statistics involves the following concepts:
– Calculation of the average;
– size and frequency;
– calculation of the average and the range;
– calculation of the first quartile and the third quartile.
Exercise 1:
There are two correctors for the brevet des collèges: the first one has an average of 11 with 55 candidates and his colleague has only 9.5 with 45 candidates.
What is the overall average.
Exercise 2:
The gendarmes carried out a speed control on the side of a national road.
| Speed (in km/h) |
[50;70[ |
[70;90[ |
[90;110[ |
[110;130[ |
| workforce |
15 |
90 |
35 |
5 |
Calculate the average speed of the motorists checked.
Exercise 3: ‘math statistics
A common mathematics assignment was offered to all the third grade classes of a college. The results out of 20 are as follows:
|
12 |
8 |
15 |
11 |
4 |
7 |
13 |
2 |
9 |
10 |
17 |
13 |
|
14 |
3 |
6 |
6 |
8 |
12 |
9 |
16 |
12 |
9 |
4 |
15 |
|
5 |
3 |
13 |
2 |
18 |
5 |
6 |
11 |
10 |
14 |
6 |
14 |
|
8 |
17 |
10 |
11 |
16 |
10 |
8 |
10 |
9 |
11 |
10 |
14 |
|
7 |
13 |
19 |
14 |
10 |
15 |
12 |
13 |
6 |
12 |
11 |
9 |
|
13 |
16 |
15 |
13 |
5 |
10 |
7 |
16 |
10 |
8 |
16 |
11 |
- Copy and complete the following table:
| Note |
0 |
1 |
….. |
20 |
| Workforce | ||||
| Frequency (%) |
2. Answer the following questions:
- – how many students were present at the test?
- – how many students scored above 10?
- – how many students scored below 12?
– What percentage of students scored above 15?
– What percentage of students got at most 7?
3. What is the median and range of these scores.
4. Math teachers take the 36 highest scoring students on a field trip.
Damien got a 10. Will he go on a field trip?
5. Calculate the average of this series of scores.
6. Determine the first quartile Q1 and the third quartile Q3.
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