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vfiekz [6]
4 years ago
15

one fourth of the 7th grade students made honor roll in the first quarter. the number of honor roll students increased by 18 in

the second quarter. If 105 students made honor roll in the second quarter. How many total 7th graders are there?
Mathematics
1 answer:
Mandarinka [93]4 years ago
3 0

1/4 of x students made the honor roll in the first quarter

1/4 of x plus 18 equals 105

1/4 x + 18 = 105

1/4 x + 18 - 18 = 105 - 18

1/4 x = 87

Reciprocal to isolate variable

4/1(1/4 x) = 87(4/1)

x = 348

There is a total of 348 students in 7th grade

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Answer:

The probability that Swallows will win the trophy is 0.8064

The probability that Rucks will win the trophy is 0.1936

Step-by-step explanation:

For each game, there are only two possible outcomes. Either the Swallows win, or they do not. The probability of them winning a game is independent of any other game, which means that the binomial probability distribution is used.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

In which C_{n,x} is the number of different combinations of x objects from a set of n elements, given by the following formula.

C_{n,x} = \frac{n!}{x!(n-x)!}

And p is the probability of X happening.

Probability the Swallows wins is 0.56

This means that p = 0.56

2 games:

This means that n = 2

The probability that Swallows will win the trophy is

Probability they win at least one game, so:

P(X \geq 1) = 1 - P(X = 0)

In which

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

P(X = 0) = C_{2,0}.(0.56)^{0}.(0.44)^{2} = 0.1936

Then

P(X \geq 1) = 1 - 0.1936 = 0.8064

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Step-by-step explanation:

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Step-by-step explanation:

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<h3>Answer:  Median = 6</h3>

==========================================================

Explanation:

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