Make Estimates from Samples

Daniel Math Academy · Grade 7 Math

Make Estimates from Samples

Skill N.9 · Statistics & sampling · ★★☆ Medium

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Write a proportion and solve it.

1. 1
   A factory checks a random sample of $500$ light bulbs and finds $6$ that do not work. Predict how many of the $10,000$ bulbs it made today do not work.
2. 2
   In a random sample of $25$ students at a school, $7$ chose pasta as their favorite lunch. The school has $800$ students. Predict how many of them would choose pasta.
3. 3
   An orchard checks $80$ apples picked at random and finds $8$ with bruises. The orchard has $2,000$ apples. About how many have bruises?
4. 4
   In a random sample of $20$ students at a school, $2$ chose tacos as their favorite lunch. The school has $500$ students. Predict how many of them would choose tacos.

Daniel Math Academy · Grade 7 Math

Answer Key

N.9 Make Estimates from Samples · ★★☆ Medium

1. 1120 bulbs
2. 2224 students
3. 3200 apples
4. 450 students