Using the frequency table below, find how many students received a score of 70 or better on a mathematics test.
A. 19
B. 12
C. 17
D. 14
There is no frequency table provided, so this question cannot be answered.
Using the frequency table below, find how many students received a score of 70 or better on a mathematics test.
50-59 2
60-69 5
70-79 5
80-89 7
90-99 2
A. 19
B. 12
C. 17
D. 14
The number of students who received a score of 70 or better is 5+7+2 = 14, so the answer is D. 14.
Barry asked 40 random students at his school to name their favorite ice cream flavor. Of the 40 students he asked, 25 of them preferred chocolate. Based on Barry's results, how many of the 1,200 students in the school most likely prefer chocolate ice cream?
A. 200
B. 450
C. 750
D. 1,000
If 25 out of 40 students prefer chocolate ice cream, then the proportion of students who prefer chocolate ice cream in the sample is 25/40 = 5/8. To estimate the number of students in the school who prefer chocolate ice cream, we can use this proportion to scale up from the sample to the population:
(5/8) x 1200 = 750
So the best estimate is that 750 of the 1,200 students in the school prefer chocolate ice cream.
Therefore, the answer is C. 750
A movie complex has eight different movie theaters. The manager of the complex wants to conduct a survey to determine which snacks to add to the menu. Which represents the best sample the manager could use for the survey?
A. Survey the first 100 movie-goers leaving the movie complex
B. Survey 100 randomly selected movie-goers that just watched a drama movie
C. Survey 100 randomly selected movie-goers in the 10-year-old to 40-year-old age bracket
D. Survey 100 randomly selected movie-goers from the entire complex
D. Survey 100 randomly selected movie-goers from the entire complex.
This would provide the most representative sample of the entire population of movie-goers. Options A, B, and C could introduce bias into the sample by only surveying specific subsets of the population. By randomly selecting from the entire complex, the sample would have an equal chance of including movie-goers of all ages, movie preferences, and snack preferences, providing the best representation of the population as a whole.
Which of the following types Winformation is suited for display on a double line graph? (1 point)
A. annual changes in Melody's height and weight from 5 to 10 years old
B. number of Democrats and Republicans in the Senate during the past decade
C. monthly sales of two different types of cars during a one-year period
D. all of these answers
D. All of these answers are suited for display on a double line graph.
A double line graph is used to display two sets of data as lines on the same graph, making it easy to compare the trends and changes over time.
Option A would show how Melody's height and weight changed over a five-year period, and could use the double line graph to show both changes on the same graph.
Option B could show the number of Democrats and Republicans in the Senate from year to year or over a decade.
Option C could compare sales of two different types of cars, such as electric cars and gasoline cars, to show their monthly sales trends.
All of these options could use a double line graph to visually display the changes over time.
The stem-and-leaf plot below shows the total number of points different gymnasts earned in a gymnastics competition. How many gymnasts scored less than 50 points?
A. 4
B. 6
C. 7
D. 8