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MAXImum [283]
3 years ago
7

Urgent please!!! I really don’t understand it, tysm to anyone who can answer thissss :))))

Mathematics
1 answer:
Tomtit [17]3 years ago
3 0

Given:

The frequency distribution table.

To find:

The mean average score on a test.

Solution:

The frequency distribution table is

Marks (x_i)                   Frequency(f_i)                  f_ix_i

     x                                     a                               xa

     y                                     b                               yb

     z                                     c                               zc

  Sum                              a+b+c                          xa+yb+zc

Now, the mean average score on the test is

Mean=\dfrac{\sum f_ix_i}{\sum f_i}

Mean=\dfrac{xa+yb+zc}{a+b+c}

Therefore, the mean average score on the test is \dfrac{xa+yb+zc}{a+b+c}.

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Amanda [17]
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4 0
4 years ago
He roots of x2 − (<br> ) + 34 are 5 ± 3i.
GrogVix [38]
Use the quadratic formula, x=\frac{-b+ \sqrt{ b^{2}-4ac} }{2a}
(don't know how to type the "-"sign in the formula, so there is only the "+" in the formula)
in this case, a=1, c=34, b is unknown
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Note: the original equation already give b as -b, so -(-b)=10, b=10
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5 0
3 years ago
Can you guys help me?​
kumpel [21]

Answer:

Step-by-step explanation:

1. y = 2x

       y = 2*4 = 8  Checks, therefore

y = 20  for x = 10

2. y = 3x

       y = 3*(0.3) = 0.9  Checks, therefore:

y =  3*(1.5) = 4.5  

       y = 3*

3. y = 5/x

       y = 5/(1/2) = 10  Checks, therefore:

       3 = 5/x

x = 5/3

4 v = wu

7*3 = 21  Checks, therefore:

v =  (3/4)*(6) = (18/4) = (9/2)

v = (2/3)wu

v = (2/3)*7*3 = 14 Checks

5 m = Kn/p  [Add the K as a constant that will make m = Knp true at some value of K]

9 = K*2/(1/3)

27 = (K*2)

27 = 2K

K = (3/2)

       m = (3/2) (n/p)

       m = (3/2)*((1/2)/(1/3))

        m = (3/2)*(3/2)

        m = 1

   

7 0
3 years ago
The radius of a circle is 14 yards. What is the circle's circumference?
WINSTONCH [101]

Answer:

87.96yd

Step-by-step explanation:

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3 years ago
Why are rate tables useful
sergij07 [2.7K]
They can show change on how much time passed.
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