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adelina 88 [10]
3 years ago
12

80 questions how many can I get wrong to get 75%

Mathematics
2 answers:
kati45 [8]3 years ago
7 0
<em>75÷100=0,75</em>

<em>0,75×80=60</em>

<em>Answer : 60</em>

<em>Good Homework :)</em>
mixer [17]3 years ago
6 0
75% is equal to 75/100, which can be reduced to 3/4. So it's 3/4 * 80 = 60
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LenaWriter [7]

Answer:

Hay 160 maneras

Step-by-step explanation:

Para calcular de cuántas maneras se puede seleccionar x elementos de un grupo de n elementos podemos usar la siguiente fórmula:

nCx=\frac{n!}{x!(n-x)!}

Si vas a elegir 3 personas de entre 6 matrimonios y dos miembros de la misma pareja no pueden ser elegidos, entonces podemos decir que se está eligiendo 3 matrimonios y en cada matrimonio se está eligiendo un representante.

Entonces, podemos calcular de cuántas maneras se puede escoger 3 matrimonios de los 6, así:

6C3=\frac{6!}{3!(6-3)!}=20

Adicionalmente, para cada uno de los 3 matrimonios hay 2 opciones para ser representantes. Esto significa que hay 2^3 maneras de escoger representantes en cada una de las 20 formas calculadas anteriormente.

Por lo tanto se puede formar el grupo de 3 personas de 160 maneras diferentes:

20*2^3=160

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3 years ago
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vovangra [49]

A is right answer

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3 years ago
In a random sample of 40 teenagers, 18 enjoy reading for fun, and in a random sample of 40 adults, 12 enjoy reading for fun. Do
Savatey [412]

Answer: Yes. The data provides convincing evidence.

Step-by-step explanation:

In a random sample of 40 teenagers, 18 enjoy reading for fun. The percentage of teenagers who enjoy reading for fun will be:

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3 years ago
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Fofino [41]

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