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Lunna [17]
3 years ago
12

In a relative frequency distribution, what should the relative frequencies add up to?

Mathematics
1 answer:
VMariaS [17]3 years ago
8 0

Answer:

A. 1

Step-by-step explanation:

The relative frequency is calculated by dividing the frequency of respective class to the total frequency. i.e R.f=f/∑f.

Hence, the relative frequencies can never be add up to total number of observations because it is computed from taking the proportion of frequency and total number of observation. The relative frequencies thus add up to 1.

For example we are given the frequencies for 3 classes as 6,4,2 and computed relative frequencies of these 3 classes are 6/12, 4/12 and 2/12.

Now adding these three relative frequencies 6/12+4/12+2/12=6+4+2/12=12/12=1.

Thus, the relative frequencies add up to 1.

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aleksandr82 [10.1K]

Answer:

Jada error was he multiplied the equation by (-9/4) to make the coefficient of x one. He should have multiplied it by 108

Step-by-step explanation:

Jada solved the equation

-4/9 = x/108

using the steps below:

-4/9 = x/108

(-4/9)(-9/4) = (x/108)(-9/4)

x = -1/48

Jada should have multiplied through by 108, instead of (-4/9). That was the error he made.

Multiplying through by 108 gives

(-4/9)(108) = (x/108)(108)

-48 = x

x = -48

The answer should have been

x = -48

and not

x = -1/48

8 0
3 years ago
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A man is standing at a radar base and observes an unidentified plane at an altitude 6000m flying towards the radar base at an an
liubo4ka [24]

Answer:

The speed in of the plane is 115.47 m/sec

Step-by-step explanation:

Given:

Height at which the plane is flying = 6000 m

Angle of elevation at the radar base = 30 Degrees

Angle of elevation at the radar base after one minute  = 60 Degrees

To Find:

The Speed of the plane in meter per second = ?

Solution:

Let us use the tangent of the angle to find the distance (d) to a point directly below plane:

<u>when the angle is 30 degrees</u>

tan(30) = \frac{6000}{d1}

d1   = \frac{6000}{tan(30)}

d1 = \frac{6000}{0.577}

d1 = 10392.3 meters

<u>when the angle is 60 degrees</u>

tan(60) = \frac{6000}{d2}

d2  = \frac{6000}{tan(60)}

d2  = \frac{6000}{1.732}\\

d2 = 3464.1 meters

<u>distance travelled by aircraft in 1 min is  </u>

=>d1 - d2

=>0392.3 - 3464.1

= 6928.2 m/min

<u>Now converting to m/sec</u>

=>\frac{6928.2}{60}

=>115.47 m/sec

4 0
3 years ago
Substitution method for 7x-2y=1 &amp; x-2y=1
RUDIKE [14]
We want to use the Substitution method to solve
7x - 2y = 1          (1)
x - 2y = 1           (2)

From equation (1), obtain
2y = 7x - 1          (3)

Substitute (3) into (2).
x - (7x - 1) = 1
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x = 0

From (3), obtain
2y = 7*0 - 1 = -1
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Answer: (0, -1/2)  or x=0, y= -1/2.

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