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dezoksy [38]
4 years ago
5

An experiment consists of 400 observations and four mutually exclusive groups. if the probability of a randomly selected item be

ing classified into any of the four groups is equal, then the expected number of items that will be classified into group 1 is _____. 25 100 125 150
Mathematics
1 answer:
Montano1993 [528]4 years ago
5 0
There are four mutually exclusive groups, therefore, the probability of one item being classified into any of the four groups is 1/4 or 0.25. 

The expected number of items is calculated as the product of the probability and the total number of observations. For this problem, the probability of an item being classified to group 1 is 0.25 and the total number of observations is 400. Therefore, the expected number of items is 
     Expected\:number\:of\:items=0.25\times 400=100

The expected number is 100.
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Complete Question:

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Answer:

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Step-by-step explanation:

Given

R = (-5,8)

Solving (a): Reflection across x-axis

The rule is:

R(x,y) ==> R(x,-y)

So, the reflection of R = (-5,8) is:

R' = (-5,-8)

Solving (b): The distance between R and R'

Distance (d) is calculated as:

d = \sqrt{(x_1 - x_2)^2 + (y_1 - y_2)^2}

Where:

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R' = (-5,-8) --- (x_2,y_2)

This gives:

d = \sqrt{(-5- -5)^2 + (-8- 8)^2}

d = \sqrt{(0)^2 + (-16)^2}

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d = 16

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Answer:

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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

Data provided in the question

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Now to find out the projected population for 2015 we use the exponential model

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Now

P = 18,000e^{10\times0.1833}

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