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3 years ago

Can you help? Please...

Mathematics

2 answers:

Illusion [34]3 years ago

8 0

Answer:

Sorry where is the question???

likoan [24]3 years ago

5 0

Yes where’s the question

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4-member curling team is randomly chosen from 6 grade 11 students and 8 grade 12 students. What is the probability that the team

Ivanshal [37]

Answer:

0.5944 = 59.44% probability that the team has at least 2 grade 11 students

Step-by-step explanation:

The students are chosen without replacement, which means that the hypergeometric distribution is used to solve this question.

Hypergeometric distribution:

The probability of x successes is given by the following formula:

$P(X = x) = h(x,N,n,k) = \frac{C_{k,x}*C_{N-k,n-x}}{C_{N,n}}$

In which:

x is the number of successes.

N is the size of the population.

n is the size of the sample.

k is the total number of desired outcomes.

Combinations formula:

$C_{n,x}$ is the number of different combinations of x objects from a set of n elements, given by the following formula.

$C_{n,x} = \frac{n!}{x!(n-x)!}$

We have that:

6 + 8 = 14 students, which means that $N = 14$

6 grade 11 students means that $k = 6$

Teams of 4 members means that $n = 4$

What is the probability that the team has at least 2 grade 11 students?

This is:

$P(X \geq 2) = 1 - P(X < 2)$

In which

$P(X < 2) = P(X = 0) + P(X = 1)$

$P(X = x) = h(x,N,n,k) = \frac{C_{k,x}*C_{N-k,n-x}}{C_{N,n}}$

$P(X = 0) = h(0,14,4,6) = \frac{C_{6,0}*C_{8,4}}{C_{14,4}} = 0.0699$

$P(X = 1) = h(1,14,4,6) = \frac{C_{6,1}*C_{8,3}}{C_{14,4}} = 0.3357$

Then

$P(X < 2) = P(X = 0) + P(X = 1) = 0.0699 + 0.3357 = 0.4056$

$P(X \geq 2) = 1 - P(X < 2) = 1 - 0.4056 = 0.5944$

0.5944 = 59.44% probability that the team has at least 2 grade 11 students

5 0

3 years ago

Which function can be represented by the graph?

stepan [7]

Answer: b

Step-by-step explanation: It is b because the y-int is -2 so we cancel a and d. For the slope when you start counting from the y-int the one that makes sense is b. HOPE IT HELPS!

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3 years ago

A wireless phone plan cost Eric $35 for a month of service during which he sent 450 text messages. If he was charged an fixed fe

Lelechka [254]

Answer:

$.05 per message

Step-by-step explanation:

450m + 12.5 = 35

450m = 35-12.5

450m = 22.5 divide both sides by 450

m=22.5/450

m=.05

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3 years ago

A theater club sold 540 tickets . On the first day, 55% of the 40 tickets were sold. how many tickets were sold on the first day

solong [7]

A lot maybe more!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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Natalija [7]

Answer:1/2

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