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zubka84 [21]
2 years ago
11

sprinter started his race slowly and then increased his speed by 14.8 miles per hour to reach a top speed of 23 miles per hour.

What was the sprinter's speed before he increased his speed?
Mathematics
1 answer:
ruslelena [56]2 years ago
6 0

Answer:

8.2

Step-by-step explanation: i think its 8.2

i dont know tho

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The highway fuel economy of a 2016 Lexus RX 350 FWD 6-cylinder 3.5-L automatic 5-speed using premium fuel is a normally distribu
Elodia [21]

Answer:

a) Standard error = 0.5

b) 99% Confidence interval:  (19.2125,21.7875)

Step-by-step explanation:

We are given the following in the question:

Population mean =  20.50 mpg

Sample standard deviation = 3.00 mpg

Sample size , n = 36

Standard Error =

=\displaystyle\frac{\sigma}{\sqrt{n}} = \frac{3}{\sqrt{36}} = 0.5

99% Confidence interval:

\mu \pm z_{critical}\frac{\sigma}{\sqrt{n}}

Putting the values, we get,

z_{critical}\text{ at}~\alpha_{0.01} = \pm 2.575

20.50 \pm 2.575(\displaystyle\frac{3}{\sqrt{36}})= 20.50 \pm 1.2875 = (19.2125,21.7875)

4 0
2 years ago
BRAINLIEST TO CORRECT
Fynjy0 [20]
Make the fractions improper:
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7 0
2 years ago
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How many $3.50 burgers can you buy for a million dollars? Give your answers to the nearest whole numbers.
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4 0
3 years ago
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Surface area of a cube is given as 480 square inches. how long is each edge? ​
MrRissso [65]

Answer:

2880

Step-by-step explanation:

(Warning I may have this wrong, and in any way shape or form you get this question wrong i apologize)

There are 6 faces on a cube, and if each face is 480 square inches you must simply multiply 6x480.

Hope this helps :)

5 0
2 years ago
The volume of a paint can is 215 in. If the height of the can is 7.5 in, what is the radius to the nearest whole number
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3 0
3 years ago
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