Dalia owns a gravel pit. She took a random sample of rocks and counted 58 sedimentary rocks, 213 metamorphic rocks, and 522 igneous rocks.
Use the observed frequencies to create a probability model for Dalia randomly selecting one rock from her gravel pit.
Input your answers as fractions or as decimals rounded to the nearest hundredth.
{write your answer in the workspace attached}
1 point
1
Question 2
2.
After Cynthia microwaves her bowl of morning porridge, it is either too cold, just right, or too hot. She estimates that there is a 35% chance that it will be too cold and a 50% chance that it will be too hot.
What is the probability that Cynthia's morning porridge will be just right?
1 point
1
Question 3
3.
A consumer report counted 72 low-quality, 112 medium-quality, and 711 high-quality computers based on a random sample. The report went on to say that all computers, regardless of quality, are packaged identically and sold at the same price.
Use the observed frequencies to create a probability model for the quality of the next computer purchased.
Input your answers as fractions or as decimals rounded to the nearest hundredth.
{write your answer in the workspace attached}
1 point
1
Question 4
4.
Michael, Ronald, Lidia, Alexandra, and Catherine are sharing a basket of fries. The following table shows an incomplete probability model for who will eat the next fry.
What is the probability that Ronald will eat the next fry?
7. SP.1: Sample Populations
1 point
1
Question 5
5.
Sweet Treats candy company wants to introduce a new flavor of jelly bean. They have three choices: Mango, Papaya, or Coconut. They decide to do a survey to determine which flavor their customers prefer. A random sample of 100 Sweet Treats customers tried a free sample of all three flavors. The data showed that 55% preferred Mango, 20% preferred Papaya, and 25% preferred Coconut.
Based on this data, which of the following conclusions are valid?
1 point
1
Question 6
6.
Santos wants to know what percentage of people who get married in his country knew each other in school.
Describe which of the following survey methods will allow Santos to make a valid conclusion about the percentage of couples married in his country who knew each other in school? AND describe how Santos can make the survey even more reliable.
a) Get a list of the 30 couples most recently married in his country, then ask them
b) Sort a list of couples married in his country into random order, then ask the first 30 couple on the list
1 point
1
Question 7
7.
A group of randomly selected Gamin Middle School athletes were asked to pick their favorite sport. The bar graph below shows the results of the survey. There are 414 athletes at Gamin Middle School.
Based on the data, what is the most reasonable estimate for the number of Gamin Middle School athletes whose favorite sport is hockey?
7.SP.C.8: Compound Probability
1 point
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Question 8
8.
We put 2 red coins and 2 white coins in a bag. What is the probability (P) of choosing a red counter followed by a white counter?
1 point
1
Question 9
9.
Ricky takes 2 coins at random from 3 quarters, 5 dimes, and two nickels in his pocket.
What is the (P) nickel then a dime, assuming the coins are replaced after each coin removal?
1 point
1
Question 10
10.
When flipping a coin, what is the probability of heads and then heads?
1 point
1
Question 11
11.
When rolling a six-sided number cube and flipping a coin, what is P(3 then tails)?