A survey of a random sample of people leaving an amusement park showed an average expenditure4 of $10.30 for the evening. The average expenditure for the 20 girls in the sample was $9.70 and for the boys it was $11.10. How many boys are there in the random sample?
DATE
Question answered on Jul 22, 2018
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Solution~000495384.zip (18.37 KB)
