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leonid [27]
3 years ago
5

Five numbers has a mean of 12. When one (1) number is removed the mean is 11. What is the value of the number removed?

Mathematics
1 answer:
bonufazy [111]3 years ago
6 0

Answer:

16

Step-by-step explanation:

The mean of a group of values is calculated as

mean = \frac{sum}{count}

Given 5 numbers with a mean of 12, then

\frac{sum}{5} = 12 ( multiply both sides by 5 )

sum = 60

let the number removed be x , then

\frac{60-x}{4} = 11 ( multiply both sides by 4 )

60 - x = 44 ( subtract 60 from both sides )

- x = - 16 ( multiply both sides by - 1 )

x = 16

The number removed was 16

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mixas84 [53]

Answer:

a) Your answer for part a (I got 3/28) is wrong.

Odds are always expressed as ratios after calculating. Therefore, the odds in favour of receiving a gift = 3:22

b) Your answer in part b(I got 7/9) is correct.

The probability of the box having a toy is 7/9.

Step-by-step explanation:

The question above has to do with odds and probability.

It is important to note that odds are expressed in the form of ratios while probabilities are expressed as fractions.

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The formula for calculating odds from probability is Odds = Probability / (1 - Probability).

Probability = 3/25

Odds =(3/25)/(1 - 3/25)

= (3/25)/22/25

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= 3/25 × 25/22

= 3/22

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Your answer for part a (I got 3/28) is wrong.

The correct answer is 3:22

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Therefore, the probability of the box having a toy is 7/9.

Your answer in part b(I got 7/9) is correct.

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Answer:

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Therefore, our equation is:

y=-9

And this is in standard form.

And we're done!

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