1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
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.

You might be interested in
What is 3/4 x = 6 what is the value of x
olasank [31]

Answer:

Step-by-step explanation:

3/4x  = 6                    Multiply both sides by 4/3

4/3 * 3/4 x = 6*4/3     Combine

x = 6 * 4/3

x = 6 * 4/3

x = 24/3

x = 8    

6 0
3 years ago
Think About the Process The length of a rectangle is twice the width. The area of the rectangle
natima [27]

Answer:

length of each square= \sqrt{43} ≈ 6.6

the length of the rectangle = 2\sqrt{43} ≈ 13.1

width of the rectangle ≈ \sqrt{43} ≈ 6.6

Step-by-step explanation:

8 0
2 years ago
They estimate that their current (older) fridge, which they got for free, costs them about $17 a month in electricity charges to
Eddi Din [679]

Step-by-step explanation:

Step one:

given

current (older) fridge

electricity charges= $17 monthly

maintenance costs= $220

let the number of months be x

and the total cost be yo

the expression for the cost for the old fridge is

yo=220+17x---------1

New  fridge

electricity charges= $6 monthly

costs=  $1,050

let the number of months be x

and the total cost be yn

the expression for the cost for the old fridge is

yn= 1050+6x---------2

Hence the system of equation for the situation is

yo=220+17x---------1

yn= 1050+6x---------2

Step two

for 10 years there are 12*10= 120 months

put x= 120 in both expressions and compare the total

yo=220+17(120)---------1

yo=220+2040

yo=$2,260

yn= 1050+6(120)---------2

yn=1050+720

yn=$1770

<u><em>Based on the analysis it will be less expensive to get the new fridge, hence buying the new fridge is worth it.</em></u>

3 0
3 years ago
A 7/16-inch bolt is used in a machine. Whatis te length of the bolt written as a decimal
drek231 [11]
\frac{7}{16}= \frac{7}{16}* \frac{625}{625} = \frac{4375}{10000}=0.4375
7 0
3 years ago
The rate of change of the volume of a snowball that is melting is proportional to the surface area of the snowball. Suppose the
Alisiya [41]

Answer:

According to the passage, we have the next equation:

\frac{dV}{dt} = \frac{4}{3}\pi*3*r^{2}*\frac{dr}{dt} = K*(4\pi*r^{2} )

where "K" is a proportional constant

Leaving at the end with the next equation:

\frac{dr}{dt} = K

Integrating the equation, we have:

r=K*t+C

where "C" is a constant

Then, we have the 2 conditions for the problem:

1) t=0 → r=10

Replacing in the equation, we have C = 10

2) t=5 → r=8

Replacing in the equation, we have K = -0.4

Finally, the time which the snowball will be completely melted will be when r = 0. So replacing in the equation

0=-0.4*t+10

t = 25 minutes

6 0
3 years ago
Other questions:
  • Which expression is equivalent to( 9x^2+2x-7)(-4)
    14·2 answers
  • Munari bought a computer for 35% off the list price. If the list price is $3,500, how much did he spend?
    7·2 answers
  • -4(x+5)=-4x-20 one solution many aolution infinite solutions?
    14·1 answer
  • when Sally picks any number between 1 and 20, doubles it, adds 6, divides by 2 and subtracts 3, she always gets the number she s
    12·2 answers
  • Starting with the definition 1.00in. = 2.54 cm, find the number of kilometers in 7.00mi . Please describe conversions.
    9·2 answers
  • Britney is buying a shirt and a hat at the mall. The shirt costs $34.79, and the hat costs $18.18. If Britney gives the sales cl
    11·2 answers
  • 3 Lizzie buys 3 clocks for a total cost of £50 at a car boot sale.
    5·1 answer
  • Determine whether the problem or question is statistical or not. Draw a happy face if the statement is statistical and sad face
    7·1 answer
  • 7 ounce- 4.58$<br> 15 ounce- 6.30$<br> Find the unit rate of both numbers
    14·1 answer
  • 1/2 s + 3/4 s + 1/4 s + 4
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!