22) a biology professor claims that, on the average, 15% of her students get a grade of ,
30% get a b, 30% get a c, 10% get a d, and 15% get an f. the grades of a random
sample of 117 students were recorded. the following table presents the results.
grade 1 1
observed | 12
2
51
3
23
4
28
5
3
what is the value of x? ?
a) 11.143
d) 47.900
c) 9.488
b) 49.038
c.
there were 40 individuals in the category 0

30

step-by-step explanation:

times by times

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.

a

step-by-step explanation:

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