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pogonyaev
4 years ago
15

Create a word problem that involves speed

Mathematics
1 answer:
lana66690 [7]4 years ago
6 0

A hockey puck is sliding on frictionless ice on an infinite hockey rink.
Its speed is 36 km/hour.  How far does the puck slide in 10 seconds ? 

 (36 km/hr) x (1,000 m/km) x (1 hr/3600 sec) x (10sec) =

         (36 x 1,000 x 10 / 3,600) meters  =  <em>100 meters</em>

What is the puck's speed in miles per hour ?

        (36 km/hr) x (0.6214 mi/km)  =  <em>22.37 mi/hr</em>


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Step-by-step explanation:

The given data values that represents the population:

2, 6, 3, and 1.

Number of values : n=4

Mean of the data values = \dfrac{\text{Sum of values}}{\text{No. of values}}

\dfrac{2+6+3+1}{4}=\dfrac{12}{4}=3

Sum of the squares of the difference between each values and the mean =

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=-1^2+3^2+0^2+(-2)^2

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Now , Variance = (Sum of the squares of the difference between each values and the mean ) ÷ (n)

= (14) ÷ (4)= 3.5

Hence, the  variance is 3.5.  

Therefore , the correct  answer is "E. none of the above".

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