7th grade- 15 , 15 , 30
8th grade- 19 , 26 , 45
Total- 34 , 41 , 75
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How to find the missing values?
- In the given table, we can see the total is 75 comprising of all 7th and 8th grade
- Total of 8th grade is 45
∴ Total of 7th grade students = (75-45) = 30
- In 7th grade, the total is 40, that comprises students spending both more or less than one hour a day on social media.
∴ Students spending more than one hour in 7th grade = (30-15) = 15
- Again, total students spending less than one hour in social media comprising of both 7th and 8th grade is 41
∴ total students spending less than one hour in social media in 8th grade is ( 41 - 15) = 26
- Again, total number of 8th grade students is 45
∴ total students spending more than one hour in social media in 8th grade is (45 - 26)= 19
∴ Total number of students spending more than an hour in social media comprising of 7th and 8th grade is ( 15+19) = 34
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