Question

warm-up
you flip 3 coins 20 times and record the number of heads. the results are listed below.
2, 1, 0, 2, 2, 0, 2, 2, 3, 2, 1, 2, 1, 2, 1, 1, 2, 1, 3, 1
complete the frequency table.
a = $\boldsymbol{square}$ ; b = $\boldsymbol{square}$ ; c= $\boldsymbol{square}$ ;
d = $\boldsymbol{square}$

number of heads	frequency
1	b
2	c
3	d

done

Explanation:

Step1: Count occurrences of 0

Count how many times 0 appears in the data set: 2, 1, 0, 2, 2, 0, 2, 2, 3, 2, 1, 2, 1, 2, 1, 1, 2, 1, 3, 1.
<Expression>Count of 0 = 2</Expression>

Step2: Count occurrences of 1

Count how many times 1 appears in the data set.
<Expression>Count of 1 = 8</Expression>

Step3: Count occurrences of 2

Count how many times 2 appears in the data set.
<Expression>Count of 2 = 8</Expression>

Step4: Count occurrences of 3

Count how many times 3 appears in the data set.
<Expression>Count of 3 = 2</Expression>

Answer:

$a=2$; $b=8$; $c=8$; $d=2$