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ehidna [41]
3 years ago
11

How can you find 75% of any number?

Mathematics
2 answers:
Elena-2011 [213]3 years ago
8 0

Answer:

Multiply the number you want to find 75% of by 0.75

Step-by-step explanation:

Aleks04 [339]3 years ago
5 0

Answer:

Step-by-step explanation:

Multiply it by 0.75, or find 3/4 of that number. Whichever you prefer! The first one always works though the second one sometimes does but sometimes 3/4 of the number isn't that obvious.

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11Alexandr11 [23.1K]

Answer:

9072 or 47

Step-by-step explanation:

6 0
3 years ago
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Teacl Smolts are young salmon at a stage when their skin becomes covered with silvery scales and they start to migrate from fres
erma4kov [3.2K]

Answer:

a) s = 8.81

b) Q1 = 43.4, Q2 = 49.4, Q3 = 57.35

c) See below

Step-by-step explanation:

(a) Find the standard deviation of the reflectance for these smolts. (Round your answer to two decimal places.)

In order to find the standard deviation, we need the mean first. The mean is defined as

\bar x=\displaystyle\frac{\displaystyle\sum_{i=1}^{n}x_i}{n}

where the x_i are the values of the data collected and n=50 the size of the sample.

So, the mean is

\bar x=50.882

Now, the standard deviation of the sample is defined as  

s=\sqrt{\displaystyle\frac{\displaystyle\sum_{i=1}^n(x_i-\bar x)^2}{n-1}}

and we have that our standard deviation is

s = 8.81

(b) Find the quartiles of the reflectance for these smolts

To find the quartiles, we must sort the data from lowest to largest:  

33.6,  37.7,  38.3,  38.7,  42,  42,  42.2,  42.4,  42.7,  42.8,  42.9,  43.1,  43.7,  43.8,  44.2,  44.6,  45.5,  45.7,  46.3,  46.6,  47.4,  47.6,  47.7,  47.9,  49.2,  49.6,  50.5,  50.9,  51.3,  53,  53.9,  54.8,  54.9,  55.5,  56,  56,  56.2,  57.1,  57.6,  58.3,  59,  59.5,  60.4,  63.2,  63.4,  63.5,  64.6,  68,  69.1,  69.2

The <em>first quartile</em> is the number between the 12th and the 13th data (so 25% of the data are below it and 75% above it)

So the 1st quartile is

Q_1=\displaystyle\frac{43.1+43.7}{2}=43.4

The <em>2nd quartile is the median</em>, the point between the 25th and 26th data, it splits the data in two halves.

Q_2=\displaystyle\frac{49.2+49.6}{2}=49.4

The 3rd quartile is the point between the 38th and 39th data (so 75% of the data are below it and 25% above it)

Q_3=\displaystyle\frac{57.1+57.6}{2}=57.35

(c) Do you prefer the standard deviation or the quartiles as a measure of spread for these data? Give reasons for your preference.

In this case, we prefer the quartiles as a measure of spread since the data are very scattered around the mean and there is no a central tendency.

3 0
3 years ago
The hypotenuse of a right triangle measures 17 cm and one of its legs measures 13 cm. Find the measure of the other leg. If nece
Ne4ueva [31]

Step-by-step explanation:

13^2 + x^2 = 17^2

169 + x^2 = 289

289 - 169 = 120

x^2 = 120

\sqrt{120}  = 10.9544511501

x = 11.0

5 0
2 years ago
pls halp i really need it... pls dont answer thisif u dontknow bc this is my final thing i have to do for the 9 weeks and im try
taurus [48]

Answer: 5/16 (the first one)

s/80 the second one

Step-by-step explanation: it says the ratio for 7th grade simmers to all swimmers is 5:16 so that’s ur first box and it said there are 80 total swimmers so, 80 goes in the other one

5 0
3 years ago
The radius of a semicircle is 5 yards. What is the semicircle's diameter?
mart [117]

Answer:

Diameter: 10 Yards

Step-by-step explanation:

d = 2r

d = 2 ( 5 )

d = 10

7 0
3 years ago
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