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3 years ago

6

A fish tank contains as many goldfish as mollies, and there are 6 more guppies than goldfish. If the total combined number of fi

sh in the tank is 22, how many mollies are in the tank?

2 answers:

Nadusha1986 [10]3 years ago

6 0

Answer:

8 mollies

Step-by-step explanation:

22-6=16

16/2=8 mollies

lapo4ka [179]3 years ago

4 0

Answer:

5

Step-by-step explanation:

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Last week, Becky went to dance class 4 times. Each class was 3/2 hours.

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3 years ago

Suppose that you randomly draw one card from a standard deck of 52 cards. After writing down which card was drawn, you replace t

34kurt

Answer:

The probability is 0.0775

The expected value is 4.75 clubs

The standard deviation is 1.8875 clubs

Step-by-step explanation:

The variable X follows a binomial distribution, because we have n identical and independent events (19 cards) with a probability p of success and 1-p of fail (there is a probability of 1/4 to be club and 3/4 to be diamond, heart or spade). Then, the probability that x of the n cards are club is:

$P(x)=\frac{n!}{x!(n-x)!}*p^{x}*(1-p)^{n-x}\\P(x)=\frac{19!}{x!(19-x)!}*0.25^{x}*(0.75)^{19-x}$

So, the probability P of drawing at least 8 clubs is:

P = P(8) + P(9) + P(10) + ... + P(18) + P(19)

Replacing, the values of x, from 8 to 19, on the equation above, we get:

P = 0.0775

Additionally, the expected value E(x) and standard deviationS(x) for this distribution is given by:

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3 years ago

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Neko [114]

Answer:

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Step-by-step explanation:

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3 years ago

What is the value of the expression 2/4^-3?

Kisachek [45]

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