2 years ago

Add the two mixed numbers 1 1/3 + 3 2/3 = ?

Mathematics

1 answer:

pychu [463]2 years ago

8 0

<em><u>im not sureeeeeeeeeeeeeeeeeeeeeeeee</u></em>

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Step-by-step explanation:

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What is 2/5 divided by 4/3

Andrej [43]

Answer:

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Step-by-step explanation:

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2 years ago

Assume a normal distribution and that the average phone call in a certain town lasted 4 min, with a standard deviation of 1 min.

olya-2409 [2.1K]

SOLUTION

The mean is 4min

standard deviation is 1min

the z score is

$z=\frac{x-\bar{x}}{\sigma}$

where

$\begin{gathered} x=3 \\ \bar{x}=4 \\ \sigma=1 \end{gathered}$

then we have

$\begin{gathered} z=\frac{3-4}{1}=\frac{-1}{1}=-1 \\ z=-1 \end{gathered}$

The probability the call lasted less than 3 min will be

Therefore, the probability that (z < -1 ) is

[tex]\begin{gathered} Pr(z<-1)=Pr(0Hence, the percentage of the calls that lasted less than 3 min is 16%

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1 year ago