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Julli [10]
2 years ago
9

Giving a test to a group of students, the grades and gender are summarized below

Mathematics
1 answer:
GenaCL600 [577]2 years ago
7 0

Answer:

59 / 71

Step-by-step explanation:

Given the data :

A B C Total

Male 20 10 13 43

Female 15 2 11 28

Total 35 12 24 71

The probability of randomly selecting a Student that got B ;

Probability = required outcome / Total possible outcomes

P(getting B) = number of students who got B / total number of students

P(getting B) = 12 / 71

Probability of getting B = 12 /71

Probability of not getting B = P(getting B)' = 1 - P(getting B)

Probability that student did not get "B" = 1 - 12/71 = 59 / 71

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If two triangles have three congruent, corresponding angles, what addiitional infortmation is needed to prove that the triangles
wariber [46]

Answer:

None

Step-by-step explanation:

The information is already enough to prove that the triangles are congruent.

7 0
3 years ago
1
Alona [7]

The speed of current will be "4.5 mph" and the rate Pratap can row in still water will be "8.5 mph".

What does "speed" mean in mathematics?

  • Speed is what it means. the speed of a change in an object's location in any direction.
  • Speed is defined as the ratio of distance to the amount of time it took to cover that distance.
  • Speed is a scalar quantity because it just has a direction and no magnitude.

Given:

Distance "26 miles" in time "2 hours".

Let,

Speed of water = y

Pratap speed when rowing in still water = x

As we know,

      Speed = distance/time

then,

  x + y = 26/2

  x + y = 13

 x = 13 - y

In return trip took him time "6.5 hours",

       x - y = 26/6.5

      x - y = 4

By substituting the value of "x", we get

 13 - y - y = 4

  13 - 2y = 4

     2y = 13 - 4

        2y = 9

          y = 9/4 = 4.5 mph (Rate of the current)

By substituting the value of "y", we get

    x = 13 - a

   x = 13 - 4. 5 = 8.5 mph (Pratap can row in still water)

Learn more about speed

brainly.com/question/28224010

#SPJ13

4 0
1 year ago
Please use distribution and no need to graph.
Dafna1 [17]

Answer:

y = -6x + 3

Step-by-step explanation:

y = -3(2x) -3(-1) = -6x + 3(1) = -6x + 3

7 0
2 years ago
1/4 Divided by 16 3/4 (Detailed, worked out answer please)
scZoUnD [109]
14 would probably be the answer idk
8 0
3 years ago
Read 2 more answers
Factorise 3x + 5x – 12​
Daniel [21]

Answer:(x+3)(3x+4)

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
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