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dusya [7]
2 years ago
7

The mean score of a placement exam for entrance into a math class is​ 80, with a standard deviation of 10. Use the empirical rul

e to find the percentage of scores that lie between 60 and 80.​ (Assume the data set has a​ bell-shaped distribution.)
Mathematics
1 answer:
Sedbober [7]2 years ago
5 0

Answer:

47.5%

Step-by-step explanation:

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harkovskaia [24]
This image shows that these triangles are not congruent because they don’t line up
6 0
3 years ago
Paris is 4,000 miles away from Columbus, Ohio. It takes an airplane 8 hours to fly there. What is the speed of the airplane
eimsori [14]

Answer:

500

Step-by-step explanation:

if you take 4,000 miles and divide it by 8 hours, it will give you 500, so that how we figure the speed.

The final answer is 500.

5 0
2 years ago
An older person is 4 years older than 7 times the age of a younger person. The sum of their ages is 44. Find their ages
Fynjy0 [20]

Answer:

5 yr and 39 yr

Step-by-step explanation:

Let x = the age of the younger

then 7x + 4 = the age of the older

Now x + 7x + 4 = 44

8x + 4 = 44

8x = 40

x = 5

7x + 4 = 7(5) + 4 =  35 + 4 = 39

Check:  5 + 39 = 44

8 0
2 years ago
Find the surface area of the trapezoidal
Fofino [41]

Answer:

916 in.

Step-by-step explanation:

Step by Step.

5*10 = 50, and 50*2 = 100

10*4 = 40, and 40 * 2 = 80

(4*6)/2 = 12, and 12 * 2 = 24

10*10 = 100, and 100 * 2 = 200

16*16 = 256, and 256 * 2 = 512

Adding this together, we get: 916 inches.

6 0
3 years ago
Calculate the length of the diagonal AB
Vesna [10]

Answer:

Please add a attachment.

Step-by-step explanation:

6 0
3 years ago
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