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Mathematics 7 Online
OpenStudy (anonymous):

help on this last question please???

OpenStudy (anonymous):

OpenStudy (anonymous):

can you help me please??

OpenStudy (anonymous):

@mathmath333

OpenStudy (mathmath333):

wait

OpenStudy (mathmath333):

i think its a

OpenStudy (mathmath333):

as option b,c and d are contradicted

OpenStudy (anonymous):

I'm confused... /:

OpenStudy (mathmath333):

@aum

OpenStudy (mathmath333):

in the option b it says only 3 books

OpenStudy (mathmath333):

it will comprise of 1 book column and 2 book column (as 3=1+2)

OpenStudy (mathmath333):

=18%+24%=42% hence b is true

OpenStudy (anonymous):

so b is NOT my answer or it is?

OpenStudy (mathmath333):

no b is not

OpenStudy (mathmath333):

in d it says 4 or more book

OpenStudy (mathmath333):

so it comprise of '4' and '5 or more ' book column =12% +4% =16% hence d is also true

OpenStudy (mathmath333):

while option c has typo i think it should be "only 4% students read 5 or more books"

OpenStudy (anonymous):

how does option A work?

OpenStudy (mathmath333):

oops sorry c is not typo c is false

OpenStudy (mathmath333):

option a is true \(\large\tt \color{black}{x=\dfrac{50\times100\times24}{12\times100}=100}\)

OpenStudy (mathmath333):

hence option c is not true

OpenStudy (anonymous):

so C is my answer then?

OpenStudy (mathmath333):

yes i showed u all options

OpenStudy (anonymous):

ok, thank you (:

OpenStudy (mathmath333):

\(\Huge\tt \color{black}{\ddot\smile}\)

OpenStudy (anonymous):

Is this right? @mathmath333

OpenStudy (aum):

For the first problem: A. From the pie chart we can see 12% read 4 books and 24% read 2 books. So the number of students who read 2 books is double the number of students who read 4 books. So if 50 students read 4 books then double that number, 100 students, read 2 books. A is true. B. From the chart what percentage of students did NOT read at least 3 books? That includes percentage of students who read LESS THAN 3 books = percentage that read 2 books + percentage that read 1 book = 24% + 18% = 42%. B is true. C. From the chart only 4% read 5 or more books. It is four percent and NOT four students. Therefore, C is NOT true. D. Percentage that read 4 or more books = Percentage that read 4 books + Percentage that read 5 or more books = 12 + 4 = 16%. So D is true.

OpenStudy (aum):

For the second problem, the range of the data is the highest value minus the lowest value = 1 - (-5) = 1 + 5 = 6.

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