3 years ago

The graph below shows the cost of pens based on the number of pens in a pack. What would be the cost of one pen?

Mathematics

2 answers:

olya-2409 [2.1K]3 years ago

6 0

Answer:1.75

Step-by-step explanation: because I know pens don’t cost that much

MaRussiya [10]3 years ago

5 0

The answer would be B. $1.75

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vladimir1956 [14]

Answer:

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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

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

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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