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Nezavi [6.7K]
3 years ago
12

There are 9 students in a class: 7 boys and 2 girls.

Mathematics
2 answers:
Lilit [14]3 years ago
5 0
I think the teacher would probably pick two boys and one girl
Mrrafil [7]3 years ago
3 0

Answer:

Step-by-step explanation:

There are 9C3 total ways of picking 3 people from 9 where order does not matter.

To pick 3 boys from 6, you must do 6C3

When you do both of these you divide the smaller by the larger.

9C3 = 84

6C3 = 20

So the probability that you want is

20/84 = 0.238

If you are uncertain where the 84 comes from, it is calculated like this

9*8*7*6!       The  6!s cancel out and you are left with

=======

6! * (9 -6)!

9C3 = 9*8*7/3!

9C3 = 3 * 4 * 7 = 84

6C3 is done exactly the same way.

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I need some help!!!!!!!!!!!!!!!!!!!!!!!
vampirchik [111]

Step-by-step explanation:

We are dealing with theoretical probability. This means that our probability of said outcome is

\frac{x}{y}

where x is the outcome we want, and y is the total number of outcomes possible.

28. There is 3 triangles out of 6 polygons so the probability is 1/2.

29.There is 1 Pentagon so the probability is 1/6.

30. This is a complement to question 28. A complement is the inverse of the problem. A complement and its original add to 1 so the probability of both getting a triangle is 1/2.

31. There is 4 non quadraletrial so the probability is 2/3.

32. There is 3 figures that has more sides than three so 1/2 is the probability.

33.There is only multi right angles figures so 1/2 is the probability.

34. There is 30 days in April so the probability it's the 29th is

\frac{1}{30}

35. There is 31 days in July and 15 days after the 16th. So the probability

is

\frac{15}{31}

3 0
3 years ago
I neee help with my division imma stuck
rosijanka [135]

Answer: what division?

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
A shoe store marks up is merchandise by 8%. what was the selling price of a shoe whose whole price is $24.50?
Serjik [45]

Final price = whole sale price+ 8% whole sale price   24.50 +(8/100 × 24.50) 24.50 + 196=$ 26.46

8 0
3 years ago
Adult tickets for the school musical are sold for $3.50 and student tickets are sold for $2.50 on a given night 425 tickets were
miskamm [114]

Answer:

3.5x + 2.50y = 1237.50

425 = x + y

Step-by-step explanation:

number of adult tickets: x

number of student tickets: y

3.5x + 2.50y = 1237.50

( value of adult ticket [3.50]* number of adult tickets [x]) + (value of student ticket [2.50] * number of student tickets [y]) = total value (1237.50)

425 = x + y

(number of adult tickets [x]) + (number of student tickets [y]) = total (425)

7 0
2 years ago
The students in Todd's grade voted to select a guest speaker. 24 students voted for a famous athlete. The other 8 students in To
Colt1911 [192]

Answer:

75% of students voted for the athlete

Step-by-step explanation:

total number of students 24+8 = 32

24 out of 32 students chose the athlete

24/32 simplified = 3/4

3/4 = 75%

8 0
3 years ago
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