1) You are serving students to find out their opinion of the quality of food served in the school cafeteria . We decided to pull only does tutors who buy hot lunch at the school cafeteria on a particular day. Is your sample random? explain
2) Maria has the following scores on the exams and her social studies class: 86, 75 97, 58 94, 58.
A. Find the mean, median, and mode of the scores.
B. Should Maria's social studies teacher use the mean median or mode of the exam scores to come visit Maria that she needs to study more regularly for her exams.
3) Researchers count 30 tagged zebras in 150 total zebras in an area of a game or serv researchers counted 80 tagged zebras in 150 total zebras in an area of a game serve, how many total zebras live at the games reserve? Write a proportion to estimate the total population.
You are surveying*
Answers for 2 & 3
I don't think that I now the answers, but just saying, I don't think that it is allowed to get answers strait out of no where on jishka, but to get your answers checked.
then whats the point of jishka if we dont post this stuff?
1) The sample of students you are pulling is not random. It only includes students who buy hot lunch at the school cafeteria on a particular day. This means that your sample is not representative of the entire student population and may introduce bias. To obtain a random sample, you would need to randomly select students from the entire population, ensuring that every student has an equal chance of being included in the sample.
2) A. To find the mean of the scores, add up all the scores and divide by the total number of scores. In this case, (86 + 75 + 97 + 58 + 94 + 58) / 6 = 468 / 6 = 78.
To find the median, sort the scores in ascending order and find the middle value. In this case, the scores are: 58, 58, 75, 86, 94, 97. The middle value is 75.
The mode is the value that appears most frequently. In this case, the score of 58 appears twice, which is more than any other score.
B. To determine whether the mean, median, or mode should be used to assess Maria's study needs, we need to consider the distribution of the scores. If the scores are normally distributed and there are no extreme outliers, the mean would be the most appropriate measure to use as it takes all the scores into account. However, if there are extreme outliers or the distribution is skewed, the median might be more suitable. The mode is rarely used for assessing performance as it only indicates the most frequent score.
3) To estimate the total population of zebras at the game reserve, we can set up a proportion using the tagged zebras as a ratio. Let x represent the total population of zebras in the game reserve.
The proportion can be written as:
(30 tagged zebras / x total zebras) = (80 tagged zebras / 150 total zebras)
Now we can solve for x by cross-multiplying:
30x = 80 * 150
30x = 12000
x = 12000 / 30
x = 400
Hence, the estimated total population of zebras in the game reserve is 400.