Juanito estimated that 31% of 517 is 204. is his estimate reasonable?
a. no because his calculation should be 30% of 520

b. no because his calculation should be 40% of 520

c. yes because his calculation should be 30% of 510

d. yea because his calculation should be 40% of 510

The correct answer is B.

I think the answer is A.

Step-by-step explanation:

31% rounds to 30%, and 517 rounds to 520, so we can eliminate B, C, and D. The answer is A, because A is the closest estimate to the real answer and it is the only answer left after the elimination. The real answer is 160.27.

Hope this helped!

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.

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step-by-step explanation: