Question

a random sample of students was surveyed and asked to list their grade level and whether or not they have a pet.

· 15 seventh - graders said they dont have a pet.
· 18 eighth - graders said they have pets.
· 31 total students said they have pets.
· 25 total students said they dont have a pet.

fill in the missing values in the table below.

pets survey

	pets	no pets	total
8th grade
total

Explanation:

Step1: Find number of 7th - graders with pets

We know total students with pets is 31 and 18 eighth - graders have pets. So number of 7th - graders with pets is $31 - 18=13$.

Step2: Find number of 8th - graders without pets

We know total students without pets is 25 and 15 seventh - graders don't have pets. So number of 8th - graders without pets is $25 - 15 = 10$.

Step3: Find total number of 7th - graders

Number of 7th - graders with pets is 13 and without pets is 15. So total number of 7th - graders is $13+15 = 28$.

Step4: Find total number of 8th - graders

Number of 8th - graders with pets is 18 and without pets is 10. So total number of 8th - graders is $18 + 10=28$.

Step5: Find total number of students

Total number of students with pets is 31 and without pets is 25. So total number of students is $31+25 = 56$.

Answer:

	Pets	No Pets	Total
8th grade	18	10	28
Total	31	25	56