I will mark brainilest if someone tells me what 69 x 420 is

Mathematics

1 answer:

Ostrovityanka [42]3 years ago

4 0

Answer:

28,980

Step-by-step explanation:

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A statistics textbook chapter contains 60 exercises, 6 of which are essay questions. A student is assigned 10 problems. (a) What

Scilla [17]

Answer:

a) P=0.3174

b) P=0.4232

c) P=0.2594

d) The shape of the hypergeometric, in this case, is like a binomial with mean np=1.

Step-by-step explanation:

The appropiate distribution to model this is the hypergeometric distribution:

$P(X=x)=\frac{\binom{s}{x}\binom{N-s}{M-x}}{\binom{N}{M}}=\frac{\binom{6}{x}\binom{54}{10-x}}{\binom{60}{10}}$

a) What is the probability that none of the questions are essay?

$P(X=0)=\frac{\binom{6}{0}\binom{54}{10-0}}{\binom{60}{10}}\\\\P(X=0)=\frac{1*(54!/(10!*44!)}{60!/(10!*50!)} =\frac{2.3931*10^{10}}{7.5394*10^{10}} = 0.3174$

b) What is the probability that at least one is essay?

$P(X=1)=\frac{\binom{6}{1}\binom{54}{9}}{\binom{60}{10}}\\\\P(X=1)=\frac{6*(54!/(9!*43!)}{60!/(10!*50!)} =\frac{3.1908*10^{10}}{7.5394*10^{10}} =0.4232$

c) What is the probability that two or more are essay?

$P(X\geq2)=1-(P(0)+P(1))=1-(0.3174+0.4232)=1-0.7406=0.2594$

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3 years ago

Graph the solution of the inequality on a number line. x − (5 − 3x) ≤ 2x − 1

egoroff_w [7]

Answer:

x ≤ 2

Step-by-step explanation:

x − (5 − 3x) ≤ 2x − 1
x - 5 + 3x ≤ 2x - 1
4x - 5 ≤ 2x - 1
4x - 2x ≤ 5 - 1
2x ≤ 4
x ≤ 2 or x ∈ (- oo, 2]

The graph includes all point to the left from point 2, same point included

4 0

3 years ago

Read 2 more answers

A boardwalk that is x feet wide is built around a rectangular pond. The combined area of the pond and the boardwalk is 4x^2+140x

Archy [21]

So when X is 0, the area of the pool is 1200. That makes A and C impossible... then you can plug in numbers...say the boardwalk is 1 ft wide, add 2 to each dimension and plug in 1 for X. (You're adding 2 because there is a tile on either side of each dimension, including corners).

32x42=1344=4+140+1200

Therefore the answer is B.

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3 years ago

Rearrange the formula V = 2πr/T for r.

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