Standard deviation (50 points) 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. = . = 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

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.

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Step-by-step explanation:

for edg2020

so a parallelogram is just like a square base times height. multiply 40 and 39 to get 1560 inches.

a triangle is base times height divided by two. so multiply 7.9 and 5 and then divide it by 2 to get 19.75inches.

the kite can be split into two separate triangles and added together to get the total area. 30 x 4 /2 which equals 60. make sure to double it for the two triangles making 120.

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step-by-step explanation: