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Flashcard
•
Mathematics
•
7th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is a proportion?
Back
A proportion is an equation that states that two ratios are equal. For example, if a/b = c/d, then a, b, c, and d are in proportion.
2.
FLASHCARD QUESTION
Front
How do you find a percentage of a total?
Back
To find a percentage of a total, multiply the total by the percentage (in decimal form). For example, to find 20% of 50, calculate 50 * 0.20 = 10.
3.
FLASHCARD QUESTION
Front
What is the formula for predicting outcomes based on a sample?
Back
The formula is: (Number of favorable outcomes in the sample / Total number of outcomes in the sample) * Total number of outcomes in the population.
4.
FLASHCARD QUESTION
Front
If 3 out of 20 students prefer chocolate ice cream, how do you predict the number of chocolate ice cream lovers in a class of 100 students?
Back
Use the proportion: (3/20) * 100 = 15. So, you would predict 15 students prefer chocolate ice cream.
5.
FLASHCARD QUESTION
Front
What is a random survey?
Back
A random survey is a method of collecting data where each member of a population has an equal chance of being selected.
6.
FLASHCARD QUESTION
Front
How do you calculate the expected number of incorrect answers on a test?
Back
To calculate the expected number of incorrect answers, use the ratio of incorrect answers from a smaller test and apply it to the larger test. For example, if 4 out of 25 are incorrect, for 150 questions, it would be (4/25) * 150 = 24.
7.
FLASHCARD QUESTION
Front
What does it mean to extrapolate data?
Back
Extrapolating data means estimating or predicting values outside the range of the data you have, based on the trends observed in the data.
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