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3 years ago

In a class no of girls is 11 more than the no of boys .If the total no.of students in the class is 55 how many are girls?

Mathematics

2 answers:

bagirrra123 [75]3 years ago

7 0

So the way I answer these questions is using an equation

(x is no. Of students )

Girls= x+11

Boys = x

2x+11= 55

2x=44

x=22

So the boys are 22 and to get the girls, you add 11. The answer would be 33 girls

True [87]3 years ago

6 0

Answer: There are 33 girls in the class

Step-by-step explanation:

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(a)

The distribution of the random variable X is:

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(b)

Compute the probability that a randomly selected person at the hot springs stays longer than 60 minutes as follows:

$P(X>60)=P(\frac{X-\mu}{\sigma}>\frac{60-73}{16})\\=P(Z>-0.8125)\\=P(Z$

*Use a z-table for the probability.

Thus, the probability that a randomly selected person at the hot springs stays longer than an hour is 0.7910.

(c)

Compute the probability that a randomly selected person at the hot springs stays less than 45 minutes as follows:

$P(X$

*Use a z-table for the probability.

Thus, the probability that a randomly selected person at the hot springs stays less than 45 minutes is 0.0401.

(d)

Compute the probability that a randomly person spends between 60 and 90 minutes at the hot springs as follows:

$P(60$

*Use a z-table for the probability.

Thus, the probability that a randomly person spends between 60 and 90 minutes at the hot springs is 0.6464

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