During a recent survey of two middle school classrooms, 1/3 of the students reported that they bring their lunch to school. Another 1/4 reported that they buy their lunch in the cafeteria and 1/6 reported going home for lunch. The remaining 18 students reported that they don't eat lunch. How many students are in the two classes?
let the total be x students
so x/3 + x/4 + x/6 + 18 = x
multiply by 12
4x + 3x + 2x + 216 = 12x
finish it up
im now gonna use this form for bot sorry 2017 ITS MINE NOW WHOOOOOOO
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You want to estimate the number of students who bring their lunch to school every day. Which of the following is the best sample for this situation @bot
Responses
45 first-year students selected at random
50 female students selected at random
all members of the Math Club
80 students selected at random during lunch
The best sample for estimating the number of students who bring their lunch to school every day would be "80 students selected at random during lunch." This is because the sample is taken from the population in question and during the relevant time period. Sampling 80 students during lunch will provide a more accurate estimate of the number of students who bring their lunch to school than selecting a smaller or different group of students, such as first-year students or female students.
A coffee shop owner is interested in determining what people think about the new coffee flavor. Which of the following is the population in this situation? @bot
Responses
all customers who bought the new coffee
all customers who did not buy the new coffee
100 random customers
the first 50 customers who bought the new coffee
The population in this situation is "all customers who bought the new coffee." This is because the coffee shop owner is interested in the opinions of all customers who tried the new coffee flavor, and therefore, this group represents the whole population that the owner is interested in. The other options, such as "all customers who did not buy the new coffee," "100 random customers," or "the first 50 customers who bought the new coffee," may represent smaller subgroups of the population but are not representative of the entire population of interest.
Tom wants to know the average number of musical instruments students in his school play. He used the school’s two band classes, consisting of a total of 48 students, as his representative sample. He concluded that students in his school play an average of three musical instruments. Is his conclusion valid? @bot
No, because his representative sample is too large.
Yes, because all members of the sample play at least one musical instrument.
Yes, because the sample includes both males and females who play musical instruments.
No, because he did not choose students randomly.
No, because he did not choose students randomly. In order for his conclusion to be valid, he needs to make sure that his chosen sample is representative of the entire school population. By using only two band classes, he may be overrepresenting the number of students who play musical instruments, as students in band classes are more likely to play an instrument. Additionally, by not choosing students randomly, he may be introducing bias into his sample selection, which can affect the validity of his conclusion.
A survey is conducted to determine the most common reason people own a cell phone. A company sent out a survey to customers between the ages of 20 and 30. Based on the responses, the company concluded that people own a cell phone for messaging purposes. Is this conclusion valid? @bot
Yes, because the sample includes all customers between the ages of 20 and 30.
No, because not all people who own a cell phone have the same probability of being selected.
Yes, because the sample includes male and female customers.
No, because the sample includes customers of too many different ages.