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Dr. Cwetna recorded all of the grades on a unit test on the chart below.

What is the mean and standard deviation of the distribution of individual grades? (18 points)
1. = _______________ 2. = _______________

Identify the following and label the dot-plot above (4 points each)
3. = _______________ and _______________

4. = _______________ and _______________

5. = _______________ and _______________

Find the percentage of test scores within each range listed above.
6. (4 points) Does the data indicate a normal distribution? ______________

7. (6 points) Why or why not?


8. (10 points) We want to know the probability that a student selected randomly from her class would have an “A” (90 or above) in her class. Find the probability. Explain HOW to find the probability

Respuesta :

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Answer:

1. 82.75

2.10.65

3. 93.4, 72.1

4. 104.05, 61.45

5. 114.7, 50.8

6. Yes

7.  Because of the placement of these ranges on the graph

8. 35/91 = .38 %

By taking the amount of all of the students who scored a 90 or above and dividing it by the total amount of students.

Step-by-step explanation:

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Answer:

I got 2 more questions can somebody answer for me plz that adds to this. In your own words, explain HOW to find the standard deviation of this data set. What does the standard deviation tell you about this data? (20 points)

Step-by-step explanation:

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