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3 years ago

9/20 = ?/100 I need help please

Mathematics

2 answers:

Zinaida [17]3 years ago

8 0

Answer:

Step-by-step explanation:

Artemon [7]3 years ago

3 0

Answer:

0.45

Step-by-step explanation:

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A pathologist has been studying the frequency of bacterial colonies within the field of a microscope using samples of throat cul

nata0808 [166]

Answer:

P(0) = 0.055

P(1) = 0.16

P(2) = 0.231

P(3) = 0.224

P(4) = 0.162

P(5 or more) = 0.168

Step-by-step explanation:

In a Poisson distribution, the probability that X represents the number of successes of a random variable is given by the following formula:

$P(X = x) = \frac{e^{-\mu}*\mu^{x}}{(x)!}$

In which

x is the number of sucesses

e = 2.71828 is the Euler number

$\mu$ is the mean in the given interval.

Here λ = 2.90 is the average number of bacteria colonies per field.

This means that $\mu = 2.90$

Compute P(r) for r = 0, 1, 2, 3, 4, and 5 or more.

$P(0) = \frac{e^{-2.9}*(2.9)^{0}}{(0)!} = 0.055$

$P(1) = \frac{e^{-2.9}*(2.9)^{1}}{(1)!} = 0.16$

$P(2) = \frac{e^{-2.9}*(2.9)^{2}}{(2)!} = 0.231$

$P(3) = \frac{e^{-2.9}*(2.9)^{3}}{(3)!} = 0.224$

$P(4) = \frac{e^{-2.9}*(2.9)^{4}}{(4)!} = 0.162$

5 or more:

This is

$P(X \geq 5) - 1 - P(X < 5)$

In which:

$P(X < 5) = P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3) + P(X = 4) = 0.055 + 0.16 + 0.231 + 0.224 + 0.162 = 0.832$

$P(X \geq 5) - 1 - P(X < 5) = 1 - 0.832 = 0.168$

P(5 or more) = 0.168

7 0

3 years ago

Write the equation of the line that is perpendicular to y=1/2x+3 and has a y-intercept of -4

ANTONII [103]

Answer:

y=-2x-4

Step-by-step explanation:

When an equation is perpendicular, then it is the equation's inverse. The inverse of 1/2 is -2

The y-intercept is b in y=mx+b. In this equation, b=-4

4 0

3 years ago

A glass pitcher can hold 1 out of 2 gallon of water if Mrs Corbett filled up 4 pitchers,how many gallons of water would she have

lutik1710 [3]

Answer:

she would have 4 gallons of water

Step-by-step explanation:

this is if they all just hold 1 gallon and she has 4 gallons

8 0

3 years ago

200 students, which was 40% of the 7th graders said that the dress code was an important issue at school. How many students are

Ymorist [56]

Answer:

there are 80 students

Step-by-step explanation:

4 0

4 years ago

Subtract the fraction 7/8-1/4 Write the difference in simplest form A:3/8 B:5/8 C:7/8 or D:11/8

Svetradugi [14.3K]

Answer:

B: 5/8

Step-by-step explanation:

To find the answer you have to find a common factor and you could use 8 so 1/4 would be 2/8 and you subtract that from 7/8 to get the answer.

7 0

3 years ago