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Zinaida [17]
3 years ago
9

The time to fly between New York City and Chicago is uniformly distributed with a minimum of 120 minutes and a maximum of 150 mi

nutes. What is the distribution's standard deviation? Select one: a. 8.66 minutes b. 75 minutes c. 135 minutes d. 270 minutes
Mathematics
1 answer:
rewona [7]3 years ago
4 0

Answer:

a. 8.66 minutes

Step-by-step explanation:

Since the flight times are uniformly distributed, the standard deviation can be calculated as follows:

\sigma = \frac{b-a}{\sqrt{12}}

Where '<em>b' </em>is the maximum flight time (150 minutes) and '<em>a' </em>is the minimum flight time (120 minutes):

\sigma = \frac{150-120}{\sqrt{12}}\\\sigma = 8.66\ minutes

The distribution's standard deviation is 8.66 minutes.

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Answer:

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Can anyone please help me in this
Alik [6]

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We know that we can solve one variable equation easily. For example...

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x+y=2

2y-y=1

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-(-12x-9y=-6)

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-3x=3

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4) 8x+4y=12 ---> 24x+12y=36

7x+3y=10 ---> 28x+12y=40

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4y=4

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    4x+3y=-7

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4x+3(-1)=-7

4x=-4

x=-1

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5x+4y=12 ---> 15x+12y=36

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Which represents a quadratic function?
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Airline fares for a flight from Dallas to Austin are $30 for first class and $25 for tourist class. If a flight had 52 passenger
posledela

There were 40 tourist class passengers and 12 first class passengers.  

Explanation:

Let the number of passengers who booked for tourist class be

=

x

Then, number of passengers who booked for first class

=

52

−

x

According to question,

Total money paid = $25(tourist class)+$30(first class)  

$

1360

=

$

25

(

x

)

+

$

30

(

52

−

x

)

1360

=

25

x

+

1560

−

30

x

1360

−

1560

=

25

x

−

30

x

−

200

=

−

5

x

x

=

−

200

−

5

x

=

40

So, there were 40 tourist class passengers.

Now first class passengers

=

52

−

x

=

52

−

40

=

12

∴

There were 40 tourist class passengers and 12 first class passengers.  

As a check

Total money paid = $25(tourist class)+$30(first class)  

R

H

S

=

$

25

(

40

)

+

$

30

(

12

)

$

1000

+

$

360

=

$

1360

L

H

S

=

$

1360

Hence verified.

8 0
3 years ago
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