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2 years ago

Please help me I will mark you the brainliest

Mathematics

2 answers:

Andrei [34K]2 years ago

7 0

Answer:

15 days

Step-by-step explanation:

So if it takes 6 people 10 days how long will it takes 4 people?

You multiply 6 by 10 which gives you 60 then divide by 4

your answer is 15 days

~~~Inuola1234

bixtya [17]2 years ago

4 0

Answer:

15days

Step-by-step explanation:

6workers= 10 days

4 workers= 6×10/4= 60/4=15

15 days

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Let x denote the lifetime of a mcchine component with an exponential distribution. The mean time for the component failure is 25

aliina [53]

Answer:

0.1353 = 13.53% probability that the lifetime exceeds the mean time by more than 1 standard deviations

Step-by-step explanation:

Exponential distribution:

The exponential probability distribution, with mean m, is described by the following equation:

$f(x) = \mu e^{-\mu x}$

In which $\mu = \frac{1}{m}$ is the decay parameter.

The probability that x is lower or equal to a is given by:

$P(X \leq x) = \int\limits^a_0 {f(x)} \, dx$

Which has the following solution:

$P(X \leq x) = 1 - e^{-\mu x}$

The probability of finding a value higher than x is:

$P(X > x) = 1 - P(X \leq x) = 1 - (1 - e^{-\mu x}) = e^{-\mu x}$

The mean time for the component failure is 2500 hours.

This means that $m = \frac{2500}, \mu = \frac{1}{2500} = 0.0004$

What is the probability that the lifetime exceeds the mean time by more than 1 standard deviations?

The standard deviation of the exponential distribution is the same as the mean, so this is P(X > 5000).

$P(X > x) = e^{-0.0004*5000} = 0.1353$

0.1353 = 13.53% probability that the lifetime exceeds the mean time by more than 1 standard deviations

4 0

2 years ago

If Amber pays $55 for a pair of shoes, what would the discount be if the original price for Amber's shoes is $72.00?

baherus [9]

Answer: 76%
Explanation: 55/72.00 x __/100= 5,500
5,500 divided by 72.00= 76.3888889

8 0

2 years ago

Find the value of each expression. -5 -9 -13

Andrei [34K]

Answer:

-27

Step-by-step explanation:

-5-9=-14

-14-13=-27

3 0

3 years ago

What is the probability of not drawing a green marble? 75% 60% 2/3 4/5

chubhunter [2.5K]

Answer:

75 %

15 ÷ 20 = 0.75

0.75 × 100 = 75%

hope it helps!

4 0

3 years ago

Solve the system of equations. 5x - 7y = 58 y = -x + 2 х = y =

Romashka-Z-Leto [24]

Answer:

the x and y is 6 and -4 respectively

Step-by-step explanation:

The computation of solving the system of equations is given below:

Given that

5x - 7y = 58

And,

y = -x + 2

Put y value in the first equation

5x - 7(-x + 2) = 58

5x + 7x - 14 = 58

12x = 58 + 14

12x = 72

x = 6

So y = -6 + 2

= -4

Hence, the x and y is 6 and -4 respectively

3 0

2 years ago