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Vladimir79 [104]
3 years ago
11

Jimmy has a piece of string that is 6 3/4 inches long, and Sam has a piece of string that is 7 1/2 inches long.

Mathematics
2 answers:
mafiozo [28]3 years ago
6 0

Answer:

3/4 inches

Step-by-step explanation:

Subtract Jimmys string length from Sam's string length

7 1/2 - 6 3/4

Get a common denominator of 4

7 1/2*2/2 - 6 3/4

7 2/4 - 6 3/4

Borrow 1 ( or 4/4) from the 7

6 4/4 + 2/4 - 6 3/4

6 6/4 - 6 3/4

3/4

earnstyle [38]3 years ago
5 0

Answer:

Hello, There! My Name is Rocky <3 I'm here to help! :D

The Correct Answer is 3/4

Step-by-step explanation:

Rewriting our equation with parts separated

= 7 + 1/2 - 6 -  3/4

Solving the whole number parts

7− 6 =1

Solving the fraction parts

1/2 −3/ 4=?

Find the LCD of 1/2 and 3/4 and rewrite to solve with the equivalent fractions.

LCD = 4

2/4−3/4=−14

Combining the whole and fraction parts

1−1/4=3/4

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Let X the random variable that represent the number of children per fammili of a population, and for this case we know the following info:

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Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

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Solution to the problem

Let X the random variable that represent the number of children per fammili of a population, and for this case we know the following info:

Where \mu=2.5 and \sigma=1.7

We select a sample of n =64 >30 and we can apply the central limit theorem. From the central limit theorem we know that the distribution for the sample mean \bar X is given by:

\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})

And for this case the standard error would be:

\sigma_{\bar X} = \frac{1.7}{\sqrt{64}}= 0.2125

6 0
3 years ago
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