2 years ago

Please help! (picture is linked)

Mathematics

2 answers:

zhenek [66]2 years ago

4 0

The units of the answer should be cubed, not squared. So, it should be 80 ft^3, not 80 ft^2.

777dan777 [17]2 years ago

3 0

Answer:

<h2>IN THIS (ft2) IS THE MISTAKE ONLY (ft) WILL COME </h2>

<h3>hope it helps you </h3>

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vladimir1956 [14]

Answer:

f=11

Mode=4

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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

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4 13 28

5 4 32

$\sum f_i=1+3+f+13+4=21+f$

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

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

Using the formula

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

$73.5+3.5f=79+3f$

$3.5f-3f=79-73.5$

$0.5f=5.5$

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

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

4 repeat most times

Hence, mode of all exam scores=4

N=32

N is even

$Median=\frac{(\frac{n}{2})^{th}+(\frac{n}{2}+1)^{th}}{2}$

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

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