The following table shows the frequency of outcomes when two distinguishable coins were tossed 6,000 times and

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Question:

The following table shows the frequency of outcomes when two distinguishable coins were tossed 6,000 times and the uppermost faces were observed.
Outcome HH HT TH TT
Frequency 1,600 1,450 1,700 1,250
What is the relative frequency that heads comes up at least once? (Round your answer to four decimal places.)

Publishing The following table shows the results of a survey of 500 authors by a publishing company.
New Authors Established Authors Total
Successful 35 130 165
Unsuccessful 90 245 335
Total 125 375 500
Compute the relative frequency of the given event if an author as specified is chosen at random.
An author is unsuccessful and new.