Questions (3 points for each small question, ***24 points)
1.
To understand the proportion of a batch of data in various ranges, this batch of data will
data clustering
The amount of data falling into each group is called (
)
A.
Sample size
B. frequency
C. frequency
D. Extreme poverty
2. The maximum value of a sample with a capacity of 70 is 14 1, and the minimum value is 60. take
class interval
For 10, it can be divided into (
)
A. 10 group
B.9 group
C8 group
D.7 group
3.
After the height of n students is grouped, in
frequency table
In "165.5 ~ 170.5cm", the frequency is 4 and 0. 10, while the frequency of "155.5 ~ 160.5cm" is m and 0.20.
)
A.40 and 8
B.8 and 40
C.40 and 4
D.4 and 40
4. The relationship between frequency m, frequency p and total data n is (
)
Morning+afternoon =n
B.n=mp
C.p=mn
D.
m=np
5.
(20 10
In order to know the physical condition of the ninth grade students, a school randomly selected 30 students, tested the number of sit-ups of 1 min, and drew the chart.
Frequency distribution histogram
According to the figure, the frequency of sit-ups between15 and 20 times is (
)
A.0. 1
B.0. 17
C.0.33
D.0.4