Question

Each of three friends flips a coin 90 times. The results for each friend are shown in the tables. Find the relative frequency for the event ​"tails​" for each friend. If the friends combine their results to get 158 heads and 112 ​tails, what is the relative frequency for the event ​"tails​"? Use pencil and paper. Suppose each friend flips a coin 900 times. Is there a value you would expect the relative frequency for the event ​"tails​" to be close​ to?
Friend 1
Outcome
Frequency
   Heads
62
   Tails
28
Friend 2
Outcome
Frequency
   Heads
57
   Tails
33
Friend 3
Outcome
Frequency
   Heads
39
   Tails
51
Question content area bottom
Part 1
The relative frequency for the event ​"tails​" for Friend 1 is
  
0.31.
​(Type an integer or a decimal rounded to the nearest hundredth as​ needed.)
Part 2
The relative frequency for the event ​"tails​" for Friend 2 is
  
enter your response here.
​(Type an integer or a decimal rounded to the nearest hundredth as​ needed.)

Answer 1

Friend 1: 28/90 = 0.311... → 0.31 (given)

Friend 2: 33/90 = 0.366... → 0.37

Friend 3: 51/90 = 0.566... → 0.57

Combined: 112/(158+112) = 112/270 = 0.4148... → 0.41

If each friend flips 900 times, you would expect the relative frequency for tails to be close to 0.50 (theoretical probability for a fair coin).