3 years ago

What is 0.787878....... as a fraction

Mathematics

1 answer:

Vlad1618 [11]3 years ago

3 0

Answer:

26/33

Step-by-step explanation:

The process is:

0.787878

78.7878

78/99x then simplify

You might be interested in

F(6) if f(x) = 2x – 5

makkiz [27]

Answer:

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers

70% of kids who visit a doctor have a fever, and 40% of kids who visit a doctor have a sore throat. If the probability that a ki

MissTica

Answer: 21%

Step-by-step explanation: (.70)(.30)=0.21

4 0

3 years ago

Read 2 more answers

A triangle has angles that measure 30°,60°, and 90°. The hypotenuse of the triangle measures 10 inches. Which is the best estima

andreev551 [17]

I Hope this helped.

6 0

3 years ago

Andy has the Rope 0.9 meters long Sherry has a rope one and a half times as long as Andy's how long is Shirley's wrote

Bogdan [553]

1.35 SHOULD BE YOUR ANSWER

3 0

4 years ago

The average lifetime of a certain new cell phone is 3.4 years. The manufacturer will replace any cell phone failing within three

melisa1 [442]

Answer:

68% of these phones last 3.87 years.

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 average lifetime of a certain new cell phone is 3.4 years.

This means that $m = 3.4, \mu = \frac{1}{3.4} = 0.2941$

$P(X \leq x) = 1 - e^{-0.2941x}$

68% of these phones last how long (in years)?

This is x for which:

$P(X \leq x) = 0.68$

$P(X \leq x) = 1 - e^{-0.2941x}$

Then

$0.68 = 1 - e^{-0.2941x}$

$e{-0.2941x} = 0.32$

$\ln{e{-0.2941x}} = \ln{0.32}$

$-0.2941x = \ln{0.32}$

$x = -\frac{\ln{0.32}}{0.2941}$

$x = 3.87$

68% of these phones last 3.87 years.

4 0

3 years ago