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iogann1982 [59]
1 year ago
11

How can I Estimate the mean length. How can I select the modal class ?

Mathematics
1 answer:
Alekssandra [29.7K]1 year ago
3 0

Answer:

To estimate the mean length.

From the table lengths and its corresponding frequency are given

we know that,

The mean formula is defined as the sum of the observations divided by the total number of observations.

The formula to calculate the mean of grouped data. The formula is,

m=\frac{\sum^fx_i}{\sum^f}

we get, Midpoint of the intervals are,

0.95, 2.95, 4.95, 6.95, 8.95, 10.95

Mean is,

=\frac{0.95\times3+2.95\times33+4.95\times62+6.95\times49+8.95\times36+10.95\times7}{3+33+62+49+36+7}

we get,

=\frac{1146.5}{190}=6.034

Answer is: 6.034

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In the diagram shown, FJ bisects AD BL~=LC. The length of CD is 2 more than the length of LC, and the length of AD is
LekaFEV [45]

Answer:

The Length of AC is  17 units.

Step-by-step explanation:

Given:

BL = LC

AD = 24

AL = LD

AL = LD = half of AD = half of 24 = 12.     { FJ bisect AD }

Also,

CD = 2 + LC

To Find:

AC = ?

Solution:

By Addition Property we have

LC + CD = LD  ............{ L - C - D }

LC + ( 2 + LC ) = 12 ..........{substituting the given values}

∴ 2(LC) = 12 -2

∴ 2 (LC) = 10

∴ LC =\frac{10}{2} \\\\LC = 5\ units\\

Again,  By Addition Property we have

AC = AL +  LC      ................{ A - L - C }

AC =12 + 5

∴ AC = 17 units

∴ The Length of AC is  17 units.

5 0
3 years ago
In a store a $500 scooter is marked '20% off'. What is the sale price of the scooter?
melisa1 [442]
20% of 500 is 100, so take 100 off 500, which is 400. So, $400.
6 0
3 years ago
Evaluate the expression: -4a2 + 3ab - (2a + 3b) if a = 1/4 and b = -12
svetlana [45]

Answer:

Value of equation = 26.25

Step-by-step explanation:

Given:

Equation given

-4a² + 3ab - (2a + 3b)

Given value of a = 1/4

Given value of b = -12

Find:

Value of equation

Computation:

-4a² + 3ab - (2a + 3b)

By putting value of a and b

-4(1/4)² + 3(1/4)(-12) - [2(1/4) + 3(-12)]

-4(1/16) - (36/4) - [2/4 - 36]

-4/16 - 36/4 - [-142/4]

- 0.25 - 9 + 142/4

-0.25 - 9 + 35.5

Value of equation = 26.25

8 0
3 years ago
If h(x) = x – 7 and g(x) = x2, which expression is equivalent to(g*h)(5)? a (5 – 7)2, b (5)2 – 7, c (5)2(5 – 7), d (5 – 7)x2
asambeis [7]
H(x) = x - 7
g(x) = x^2
(g * h)(x) = x^2 (x - 7)
(g * h)(5) = 5^2 (5 - 7)
8 0
3 years ago
Which is the measure of the reference angle for 227 degrees ?
Levart [38]

Answer:

  C.  47°

Step-by-step explanation:

The angle between the terminal ray of 227° and the nearest x-axis (the negative x-axis) is ...

  227° -180° = 47°

The reference angle is 47°.

_____

In mathematical terms the reference angle is the minimum of the angle modulo 180° and the supplement of that angle.

  227° modulo 180° = 47°

  180° -47° = 133° . . . . supplement of 47°

  min(47°, 133°) = 47° . . . the reference angle

8 0
3 years ago
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