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3 years ago

The ratio of girls to boys in the school chorus is 2:3. There are 60 students in the chorus. How many are boys?

Mathematics

1 answer:

Allushta [10]3 years ago

7 0

Answer:

Step-by-step explanation:

Girls = 2

Boys = 3

2 + 3 = 5

60 / 5 = 12

Girls = 2 x 12 = 24

Boys = 3 x 12 = 36

24 + 36 = 60

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There are eight students in a class. Only one of them has passed Exam P/1 and only one of them has passed Exam FM/2. No student

Svetach [21]

Answer: There is probability of 0.57 chances that exactly three students from a group of four students have not passed Exam P/1 or Exam FM/2.

Step-by-step explanation:

Total number of students = 8

Number of student who has passed Exam P/1 = 1

Number of student who has passed Exam FM/2 = 1

No student has passed more than one exam.

According to question, exactly three students from a randomly chose group of four students have not passed Exam P/1 or Exam FM/2.

So, Probability will be

$\frac{^6C_3\times ^2C_1}{^8C_4}\\\\=\frac{20\times 2}{70}\\\\=\frac{4}{7}\\\\=0.57$

Hence, there is probability of 0.57 chances that exactly three students from a group of four students have not passed Exam P/1 or Exam FM/2.

4 0

3 years ago

Which step can you use to solve the equation m+9=−2?Add 9 to each side of the equation.Subtract 9 from each side of the equation

Mrac [35]

Answer:

Subtract 9 from each side of the equation

Step-by-step explanation:

m+9=-2

-9 -9

m=-11

7 0

2 years ago

Read 2 more answers

What's 2 meters to 76 centimeters in simplest form

Komok [63]

Answer:

I am not really getting your question. Could you comment on this answer?

1 meter = 100 centimeters

Ratio:

2 m : 76 cm

200 cm : 76 cm

2 m : 0.76 m

6 0

3 years ago

If h = n + 4, and if n = 7, what is h?<br> es )

AnnyKZ [126]

Answer:11

Step-by-step explanation:

4 0

4 years ago

Read 2 more answers

3. Suppose you are testing H0 : µ = 20 vs H1 : µ > 20. The sample is large (n = 71) and the variance, σ 2 , is known. (a) Fin

LUCKY_DIMON [66]

Answer:

We reject the null hypothesis.

Step-by-step explanation:

We are given the following information in the question:

Sample size, n = 71

Population variance is known.

Level of significance, α = 0.08

$z_{\text{stat}} = 1.56$

The null and alternate hypothesis are:

$H_{0}: \mu = 20\\H_A: \mu > 20$

We use one-tailed z test to perform this hypothesis.

Formula:

$z_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{\sigma}{\sqrt{n}} } = 1.56$

Now, $z_{critical} \text{ at 0.08 level of significance } = 1.41$

Since,

$z_{stat} > z_{critical}$

We fail to accept the null hypothesis and reject it and accept the alternate hypothesis.

7 0

3 years ago