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3 years ago

Help I forgot about this problem?

Mathematics

1 answer:

ValentinkaMS [17]3 years ago

4 0

They would not be alike, because x could be different from c.

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Grace thought of a number, added 7, multiplied by 3, took away 5 and divided by 4 to give an answer of 7.

Gemiola [76]

7 * 4 = 28
28 + 5 = 33
33 / 3 = 11
11 - 7 = 4

The number she thought of is 4

4 0

4 years ago

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10. A random sample of 10 fibers is taken from a collection of 92 fibers that consists of 43 fibers of polymer A, 17 fibers of p

vazorg [7]

Answer:

0.1150 = 11.50% probability that the sample does not contain any fibers of polymer B

Step-by-step explanation:

Hypergeometric distribution:

The probability of x sucesses is given by the following formula:

$P(X = x) = h(x,N,n,k) = \frac{C_{k,x}*C_{N-k,n-x}}{C_{N,n}}$

In which:

x is the number of sucesses.

N is the size of the population.

n is the size of the sample.

k is the total number of desired outcomes.

Combinations formula:

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

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

In this question:

Fibers are chosen without replacement, which means that we use the hypergeometric distribution.

92 fibers means that $N = 92$

Sample of 10 means that $n = 10$

No polymeter B which means that $x = 0$

17 fibers of polymeter B which means that $k = 17$

a. What is the probability that the sample does not contain any fibers of polymer B

This is P(X = 0).

$P(X = x) = h(x,N,n,k) = \frac{C_{k,x}*C_{N-k,n-x}}{C_{N,n}}$

$P(X = 0) = h(0,92,10,17) = \frac{C_{17,0}*C_{75,10}}{C_{92,10}} = 0.1150$

0.1150 = 11.50% probability that the sample does not contain any fibers of polymer B

4 0

3 years ago

You are remodeling your bedroom. You will paint all 4 walls and the door. There are 2 windows in the room. The windows both meas

Bogdan [553]

Answer: it’s easy look it up on a calculator

Step-by-step explanation:

6 0

3 years ago

What is 2+2/2+3*21 sqaured

inysia [295]

$2+ \frac{2}{2} +3*21^2$

First we solve the exponent, then multiply and finally add.

$2+ \frac{2}{2} +3*441$

$2+ \frac{2}{2} +1323$

$\frac{2}{2}= 1$

$2+ 1 +1323 = 1326$

1326 is the answer.

8 0

3 years ago

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Order the numbers from least to greatest. 1 / 100, 1/4, and 0.2.

Kamila [148]

Answer:

$\frac{1}{100}$ , 0.2, $\frac{1}{4}$

Step-by-step explanation:

First, find the values of the fractions in decimals.

$\frac{1}{100}$ = 0.01

$\frac{1}{4}$ = 0.25

So we have the numbers: 0.01, 0.25 and 0.2. Thus we can easily arrange them in ascending order.

0.01, 0.2, 0.25

Which, according to the question, will be:

$\frac{1}{100}$ , 0.2, $\frac{1}{4}$

4 0

2 years ago

Read 2 more answers