What is the probability of drawing two blue marbles if the first marble is placed back in the bag before the second draw

We want to work out the probability of choosing a blue marble, and then choosing another blue marble:

P(choosing blue marble) and P(choosing blue marble)

in probability, and means times.

So

P(choosing blue marble) x P(choosing blue marble)

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In total there are 10 marbles, and 5 are blue. So the probability of choosing a blue marble is

So:

P(choosing blue marble) x P(choosing blue marble)

= x

=        (this can simplify)

=

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Answer

it costs $20 to interview each person for a survey. find the cost to obtain a +- 3% margin of error.

step-by-step explanation:

copy and paste, put it in google

introduction, methodology, results, discussion

step-by-step explanation:

an observational study is one which consists of actual observation to record data and then analyse the data.

there are a number of factors that should be analyzed before starting an observational study.

the main four factors are:

i) introduction:   this should be analysed to check whether the purpose of the study is correctly established and the data recorded are appropriate for the study

methodology:   the method of collecting the data, such as whether randomly selected, and whether sample size matches with the population to be studied, whether questions asked are easy to answer by common men, etc.

results: then results such as summary of data with comments should be studied thoroughly

discussion:   the last is the discussion, this can be either by management people or persons who are all interested , etc.