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Kisachek [45]
4 years ago
7

A class has 20 students. If the teacher is randomly selecting a group of 3 students to represent the class on the student counci

l, what is the probability that Sarah and her two best friends will all be chosen?
1/20
3/20
1/1,140
Mathematics
2 answers:
svet-max [94.6K]4 years ago
7 0
Answer is C. 1/1,140
Stolb23 [73]4 years ago
7 0

Answer:

P(Sarah and her two best friends will all be chosen)=1/1140

Step-by-step explanation:

A class has 20 students.

The teacher is randomly selecting a group of 3 students to represent the class on the student council.

The number of ways of choosing 3 students out of 20= 20_{C_{3}}

                                                                                          = 1140

we have to find the probability that Sarah and her two best friends will all be chosen.

That means Sarah and her friends are one group to be chosen.

Hence, P(Sarah and her two best friends will all be chosen)=1/1140

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4 years ago
Which variable is ordinal?​
Leviafan [203]

Answer:

Categorical variable

Step-by-step explanation:

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6 0
3 years ago
Jenna earns $8.75 per hour working at the mall. If Jenna worked hours 20 1/5 last week, how much did she earn before taxes were
Elena-2011 [213]
To find out the amount Jenna earns, you need to multiply how much she earns per hour by the amount of hours she works for.

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7 0
3 years ago
Al final de la carrera de una famosa maratón, tres amigos, Hermes, Benito y
Fantom [35]

Answer:

Benito llega en segundo lugar.

Eladio llega en sexto lugar

Hermes llega en noveno lugar.

Step-by-step explanation:

Tenemos 3 amigos:

Benito

Hermes

Eladio

Hay 3 posiciones:

segundo

sexto

noveno.

Sabemos que:

Benito llegó antes que Hermes.

Cuando Eladio estaba llegando a la meta, solo Benito estaba descansando.

Es decir, cuando Eladio llego a la meta, Hermes aún no había llegado.

Eladio llegó a la meta antes que Hermes, pero después que Benito.

Entonces el primero en llegar es Benito, el segundo es Eladio y el tercero será Hermes.

Con la data inicial podemos decir que:

Benito llega en segundo lugar.

Eladio llega en sexto lugar

Hermes llega en noveno lugar.

3 0
3 years ago
Heheh help me moreee
Anvisha [2.4K]
Okay. So the equation is 4x² - 16. We're talking about moving 7 units to the right and 3 units down. That formula would be h(x) = 4(x - 7)² - 19, because you would add -3 to the -16 units to get -19, and you would put the parenthesis around x and the 7 in order for it to move right. Keep in mind that parenthesis around x and a term means that we move either left or right, which didn't occur in the original equation. -16 is the amount of units down and adding -3 to it makes it -19. The answer is A.
7 0
4 years ago
Read 2 more answers
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