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andrey2020 [161]
2 years ago
10

Are you good at maths?????????????????????????

Mathematics
1 answer:
Flauer [41]2 years ago
7 0

The probability that a student, chosen at random, does not study chemistry is 20/41.

<h3>What is Probability?</h3>

Probability can be defined as the ratio of the number of favorable outcomes to the total number of outcomes of an event. For an experiment having 'n' number of outcomes, the number of favorable outcomes can be denoted by x. The formula to calculate the probability of an event is as follows.

Probability(Event) = Favorable Outcomes/Total Outcomes = x/n

Here, Total number of student = 41

         Student who does not study chemistry = 20

So, the probability = favorable outcome / total outcomes

             P(not studying chemistry) = 20 / 41

Thus, The probability that a student, chosen at random, does not study chemistry is 20/41.

Learn more about Probability from:

brainly.com/question/11234923

#SPJ1

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Find the value of x in the diagram below
Ghella [55]

Answer:

x=26

Step-by-step explanation:

4x-8+34+76-x=180

4x-x-8+34+76=180

3x+102=180

3x=180-102

3x=78

x=78/3

x=26

4 0
3 years ago
Read 2 more answers
Luke invited 20 more boys than girls to his birthday party. However, only ¾ of the boys and ⅔ of the girls came. Exactly 19 of L
sveta [45]

Answer:

68

Step-by-step explanation:

Let:

Number of girls invited = x

Number of boys = x +20

3/4 of boy showed up

2/3 of girls showed up

Exactly 19 did not show up

Therefore, we could say:

Fraction of boys that didn't show up = 1 - 3/4 = 1/4

Fraction of girls that didn't show up = 1 - 2/3 = 1/3

That is,

[1/4 *(x + 20)] + [1/3*x] = 19

[(x + 20) / 4] + x /3 = 19

(3(x + 20) + 4x) / 12 = 19

3x + 60 + 4x = 228

7x = 228 - 60

7x = 168

x = 168 / 7

x = 24

Number of girls, x = 24

Number of boys, x + 20 = 24 + 20 = 44

Total friends invited = (24 + 44) = 68

8 0
3 years ago
What does the attendance need to be on Saturday to have an average attendance for the week of 30 people per day ?
mojhsa [17]

Answer: 180

Step-by-step explanation: 30 x 6= 180

6 0
3 years ago
3x + 5y = 11<br> 9x + 15y = 33
Andrei [34K]

Answer:

3x + 5y = 11      ->      y = -3/5x + 11/5

9x + 15y = 33      ->      y = -3/5x + 11/5

6 0
3 years ago
I need help with this problem since i don't know what it is.
scoray [572]

m=180-64

m=116

a=360-89-50-116

a=105

6 0
3 years ago
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