Question 1:( 1) average 15? , mode 10, median 15.
Question 2: (2) 15×500=7500 tons (2 points
Analysis:
(1) According to the data in
Question 1:( 1) average 15? , mode 10, median 15.
Question 2: (2) 15×500=7500 tons (2 points
Analysis:
(1) According to the data in the chart, the average, mode and median of 20 data can be obtained;
(2) Using the requirements in (1), the monthly water consumption of the community can be obtained.
(1) average:
10×8+ 15×6+20×4+25×2
20
= 15 ton,
Mode: ∵ maximum water consumption 10 ton, ∴ mode 10 ton;
Median: According to data number. 10, 1 1, both of which are15t, and the median is15t; ?
② The average value is15t,
∴ The monthly water consumption of this community is about:15× 500 = 7,500 tons.
Comments: This topic mainly examines the definitions of average, mode and median, and estimates the population by using samples. It is a key problem in junior high school, and students should focus on it.
On the connection between junior high school and senior high school
Shijiazhuang No.2 Middle School is a good school. You should