Facebook accounts

Facebook accounts

Interpret a two-way table

Every student at Berriwa High School was surveyed. The results are shown in the table below.

Results of a survey of Berriwa High School students

Over 16

Not over 16

Has a Facebook account

57

53

No Facebook account

43

62

Using the two-way table above, answer the following questions.

  1. How many students 16 years or younger at Berriwa High School have a Facebook account?

  2. What is the total number of students who are over 16 at Berriwa High School?

  3. What is the total number of students who do not have a Facebook account?

  4. How many students go to Berriwa High School?

  1. ‘16 years or younger’ means the same as ‘not over 16’.
    There are 53 students at Berriwa High School who are 16 years or younger and have a Facebook account.

  2. 57 + 43 = 100
    There are 100 students who are over 16 at Berriwa High School.

  3. 43 + 62 = 105
    105 students at Berriwa High School do not have a Facebook account.

  4. Every student at Berriwa High School is included in exactly one of the four numbers in the table:
    57 + 53 + 43 + 62 = 215
    There are 215 students at Berriwa High School.