3 years ago

Please help mee 3f + 4(2f - 5)

1 answer:

8 0

11f-20
Explanation:
Use the distributive property to distribute the 4 to the values in the parenthesis
3f+8f-20

Then add your like terms to get your final answer
11f-20

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The table displays the frequency of scores for a calculus class on an exam. The mean of the exam scores is 3.5. Score 1 2 3 4 5

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Explanation:

We are given that

a.Mean of the exam score, $\bar x$ =3.5

Score(x) frequency C.F

1 1 1

2 3 4

3 f 15(4+f=4+11)

4 13 28

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$\sum f_ix_i=1(1)+2(3)+3(f)+4(13)+5(4)=1+6+3f+52+20=79+3f$

$(\bar x)=\frac{\sum f_ix_i}{\sum f_i}$

Using the formula

$3.5=\frac{79+3f}{21+f}$

$73.5+3.5f=79+3f$

$3.5f-3f=79-73.5$

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$f=\frac{5.5}{0.5}=11$

b.Mode:The number which is repeat most times .

4 repeat most times

Hence, mode of all exam scores=4

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Median= $\frac{16th+17th}{2}=\frac{4+4}{2}=\frac{8}{2}=4$

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3 years ago