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Grade 7 HMH Go Math - Answer Keys
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Guided Practice
Patrons in the children’s section of a local branch library were randomly selected and asked their ages. The librarian wants to use the data to inferthe ages of all patrons of the children’s section so he can select age appropriate activities. In 3–6, complete each inference.
A manufacturer fills an order for 4,200 smart phones. The quality inspector selects a random sample of 60 phones and finds that 4 are defective. How many smart phones in the order are likely to be defective?
About _____ smart phones in the order are likely to be defective.
Part of the population of 4,500 elk at a wildlife preserve is infected with a parasite. A random sample of 50 elk shows that 8 of them are infected. How many elk are likely to be infected?
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