3 years ago

An elevator is on the twentieth floor. It goes down 11 floors and then up five floors. What floor is the elevator on now?

Mathematics

1 answer:

love history [14]3 years ago

8 0

The answer is -4

because when you minus 11 and 20 that will get you -9 and then you add 5 that get you the answer

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Yuliya22 [10]

Answer:

P [ X > 23,22 ] = 0,8798 or P [ X > 23,22 ] = 87,98 %

Step-by-step explanation:

P [ X > 23,22 ] = 1 - P [X ≤ 23,22 ]

P [X ≤ 23,22 ] = ( X - μ₀ ) / σ /√n

P [X ≤ 23,22 ] = ( 23,22 - 36,25 )/ 6,50/√36

P [X ≤ 23,22 ] = - 13,03 *6 / 6,50

P [X ≤ 23,22 ] = - 12,02 or P [X ≤ 23,22 ] = 12,02 %

(note the - sign only mean that values on the left tail of the bell shape curve)

Then

P [ X > 23,22 ] = 1 - 0,1202

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3 years ago

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2 years ago

An elevator starts at the basement with 8 people (not including the elevator operator) and discharges them all by the time it re

Rus_ich [418]

Answer:

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Step-by-step explanation:

Number of people in elevator , n = 8

Number of floors, r = 6

Since they all look alike, arrangement doesn't matter, the we use combination :

(n+r-1 r - 1) = (8+6-1 C 6-1) = 13C5

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nCr = n! / (n-r)!r!

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13C5 = 13*12*11*10*9 / 5*4*3*2*1

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3 years ago