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3 years ago

The ratio of boys to girls in the school is 1 to 4. If there are 20 girls, how many boys are there?

Mathematics

2 answers:

MaRussiya [10]3 years ago

7 0

There would be 5 boys

vaieri [72.5K]3 years ago

6 0

The answer is 5.

20 / 4 = 5

Hope this helps!

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Consider a population consisting of the number of teachers per college at small 2-year colleges. Suppose that the number of teac

agasfer [191]

Answer:

a) $\frac{8}{9}$ =0.89

b) 0.8413

Step-by-step explanation:

we know that

$P(║ x -\mu║ \leq k\sigma) \geq 1 -\frac{1}{k^2}$

$so, \mu = 150, \sigma = 20$

$k = \frac{210 - 150}{20} =\frac{150 - 90}{20} = 3$

$P(║ x -150 ║ \leq 3\times 20) \geq 1 -\frac{1}{3^2} = \frac{8}{9}$

x - N(150, 20^2)

$P(X \leq 170) = 0.8413447$

check

$P norm = \frac{170 - 150}{20}= 0.8413447$

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3 years ago

There are two functions that can be used to describe the percent of people 25 years and older who have completed at least high s

Korvikt [17]

Answer:

$g(15)=93.8\%$

see the explanation

Step-by-step explanation:

Let

x ----> the number of years since 2008,

g(x) ----> the percent of people 25 years and older who have completed at least high school

we know that

$g(x)=0.008x^2+0.42x+87.5$

For x=15 years since 2008

substitute

$g(15)=0.008(15)^2+0.42(15)+87.5=93.8\%$

That means

In the year 2023 (2008+15) the percent of people 25 and older completing at least high school will be 93.8%

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3 years ago

statuscvo [17]

Part A)

His sample only involves days during the summer (if Devin is in the northern hemisphere), which would mean that the high temperatures he'll record are likely to be higher than the average. Therefore, the sample mean he computes does not represent the average high temperature for the whole year.

----------------------------------------

Part B)

To correct his mistake, he needs to sample every day of the year. Or he could sample a few days of each month (say the first ten days of each month). That way the entire year is better represented. The other seasons of spring, fall and winter are included now.

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3 years ago

A bicycle shop advertised all mountain bikes priced at 1/3 discount.

Talja [164]

Answer:

a. 109$

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you're welcome

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3 years ago

Read 2 more answers

1.64 points as a mix number in simplest form

zhuklara [117]

The correct answer is 41/25

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3 years ago