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3 years ago

A school marching band has 200 members , there are 50 bad members who play bras instruments

Mathematics

1 answer:

tino4ka555 [31]3 years ago

5 0

Answer:

the question is incomplete but if you're wanting the ratio of band members who play brass instruments to the total amount of marching band members, the ratio is 1:4.

in other words, 1/4 of the marching band students play brass instruments.

Step-by-step explanation:

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A sample of 25 undergraduates reported the following dollar amounts of entertainment expenses last year:

marin [14]

Answer:

$Range = 85$

$\sigma = 28.71$

$Interval = [666.78, 781.62]$

Step-by-step explanation:

Given

The data for 25 undergraduates

Solving (a): Range and Standard deviation

The range is:

$Range = Highest - Least$

From the dataset:

$Highest = 772$

$Least = 687$

So:

$Range = Highest - Least$

$Range = 772-687$

$Range = 85$

The standard deviation is:

$\sigma = \sqrt{\frac{\sum(x - \bar x)^2}{n}}$

First, calculate the mean

$\bar x = \frac{769 +691 +............+715}{25}$

$\bar x = \frac{18105}{25}$

$\bar x = 724.2$

So, the standard deviation is:

$\sigma = \sqrt{\frac{(769-724.2)^2 +(691-724.2)^2 +(699-724.2)^2 +(730-724.2)^2 +............+(715-724.2)^2}{25}}$

$\sigma = \sqrt{\frac{20604}{25}}$

$\sigma = \sqrt{824.16}$

$\sigma = 28.71$

Solving (b): The interval of the 95% of the observation.

Using the emperical rule, we have:

$Interval = [\bar x - 2*\sigma, \bar x+ 2*\sigma]$

$Interval = [724.2 - 2*28.71, 724.2 + 2*28.71]$

$Interval = [666.78, 781.62]$

4 0

3 years ago

How did convenience store there is a 25% chance as customer enters the store within one minute of closing time describe the comp

valentinak56 [21]

The complementary is not entering the store one minute before closing.

The probability of not entering the store one minute before closing is 75%

7 0

4 years ago

Read 2 more answers

A tree initially measured 27 1/2 feet tall. Over the next 3 1/2 years, it grew to a final height of 35 1/2 feet. During those 3

Katen [24]

Answer:

10.14 feet per year.

Step-by-step explanation:

Given:

Over the next 3 1/2 years, a tree grew to a final height of 35 1/2 feet.

Question asked:

During those 3 1/2 years, what was the average yearly growth rate of the height of the tree?

Solution:

We can find the average yearly growth rate by using average formula, taking

final height of the tree as sum of observation and time span taken to growth as number of observation:-

As we know:

$Average=\frac{Sum\ of\ observation}{number \ of\ observation}$

$=35\frac{1}{2} \div3\frac{1}{2} \\ \\ =\frac{71}{2} \div\frac{7}{2} \\ \\ =\frac{71}{2}\times\frac{2}{7} \\ \\ =\frac{142}{14} =10.14\ feet$

Thus, during $3\frac{1}{2} \ years$ , the average yearly growth rate of the height of the tree was 10.14 feet per year

5 0

4 years ago

Evaluate ∛27 3 9 24 81 thanks.

Ugo [173]

Answer:

the correct answer is 3.

Step-by-step explanation:

3×3×3= 27

7 0

3 years ago

Read 2 more answers

Please help me with this math problem

andrey2020 [161]

Answer:

Step-by-step explanation:

How to solve your problem

3+a+3

Simplify

Add the numbers

{\color{#c92786}{3}}+a+{\color{#c92786}{3}}

3+a+3

{\color{#c92786}{6}}+a

6+a

Rearrange terms

Solution

3 0

3 years ago