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Sav [38]
3 years ago
8

PLEASE HELP!!! I HAVE A TEST!!!

Mathematics
2 answers:
Alex Ar [27]3 years ago
8 0
(55/100)x = 121
0.55x = 121
x = 121/0.55
x = 220 which means the answer is A
dsp733 years ago
4 0
PLEASE HELP!!! I HAVE A TEST!!!
121 is 55% of what number?
C. 66.55
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In a sociology class there are 1414 sociology majors and 1111 non-sociology majors. 33 students are randomly selected to present
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Answer: 0.4065

Step-by-step explanation:

Given : In a sociology class there are 14 sociology majors and 11 non-sociology majors.

Total students = 14+11=25

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Then, the number of ways to select 3 students from 25 students :-

^{25}C_3=\dfrac{25!}{(25-3)!3!}=\dfrac{25\times24\times23\times22!}{22!3!}\\\\=2300

Number of ways to select  at least 2 of the 3 students re non-sociology majors :-

^{14}C_1\times^{11}C_2+^{14}C_0\times ^{11}C_{3}\\\\=(14)\times\dfrac{11!}{2!(11-2)!}+(1)\times\dfrac{11!}{3!(11-3)!}\\\\=(14)(11\times5)+\dfrac{11\times10\times9}{6}\\\\=770+165=935

The probability that at least 2 of the 3 students selected are non-sociology majors will be :-

\dfrac{935}{2300}=0.40652173913\approx0.4065

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