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Ulleksa [173]
3 years ago
8

In a second grade class containing 12 girls and 11 boys, 2 students are selected at random to give out the math papers. what is

the probability that the second student chosen is a boy, given that the first one was a girl?
Mathematics
2 answers:
mylen [45]3 years ago
4 0

Answer:

6/23

Step-by-step explanation:

Probability is the number of possible outcome divided by the total number of outcomes. It is a ratio. Mathematically, the probability Pr of an event "a" happening given tat the total number of outcomes is T

Pr = a/T

Total number of students

= 11 + 12

= 23

The probability of picking a

Girl = 12/23

Boy = 11/23

The probability of picking a girl and  a boy (without replacement)

= 12/23 * 11/22

= 12/46

= 6/23

MrRissso [65]3 years ago
3 0
12/23 = probability first is a girl
11/22= probability second is a boy
probability of both 132/506
132/506 = 66/253
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13<img src="https://tex.z-dn.net/?f=13%5Cfrac%7B1%7D%7B4%7D%20%2B2n%3D27%5Cfrac%7B3%7D%7B4%7D" id="TexFormula1" title="13\frac{1
Len [333]

Answer:

7 1/8

Step-by-step explanation:

Assuming that the first 13 was a mistake then the equation would be 13 1/2 + 2n = 27 3/4

subtrace 13 1/2 from 27 3/4

14 1/4

divide by 2

7 1/8

7 0
3 years ago
What is the image of point (4, 5) after a counterclockwise rotation of 270º about the origin?
andriy [413]
A <span>counterclockwise rotation of 270º about the origin is equivalent to a </span><span>clockwise rotation of 90º about the origin.

Given a point (4, 5), the x-value, i.e. 4 and the y-value, i.e. 5 are positive, hence the point is in the 1st quadrant of the xy-plane.

A clockwise rotation of </span><span>90º about the origin of a point in the first quadrant of the xy-plane will have its image in the fourth quadrant of the xy-plane. Thus the x-value of the image remains positive but the y-value of the image changes to negative.
Also the x-value and the y-value of the original figure is interchanged.
For example, given a point (a, b) in the first quadrant of the xy-plane, </span><span>a counterclockwise rotation of 270º about the origin which is equivalent to a <span>clockwise rotation of 90º about the origin will result in an image with the coordinate of (b, -a)</span>

Therefore, a </span><span>counterclockwise rotation of 270º about the origin </span><span>of the point (4, 5) will result in an image with the coordinate of (5, -4)</span> (option C)
3 0
3 years ago
If drew is 3 years younger than jimmy and y is the sum of their ages what is a variable equation?
antiseptic1488 [7]
If jimmy's years is x,
then 3+2x=y
3 0
3 years ago
Read 2 more answers
Help me I need to know before 8:20am today
lozanna [386]

Answer:

184= 4(6y+4)

184= 24y +16

184 -16 = 24y

168=24y

168/24=y

y= 7

6 0
3 years ago
I need help solving this quick pleaseeeeeee
Likurg_2 [28]

Answer:

Step-by-step explanation:

angle 1 and angle 2 add to 180 degree because they are supplementary angel and in supplementary angle sum of two angles is 180 degree

angle 1 and angle 3 is equal as they are vetically opposite angles and vertically opposite angles are always equal.

angle 3 and 4 add to 180 degree because they are supplementary angle and in supplementary angle sum of two angles id 180 degree.

angle 2 and angle 4 are equal because they are vertically opposite angles and vertically opposite angles are always equal.

5 0
3 years ago
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