10. ( am 1 ec(Use the following data to answers questions 7-11)0 he contingency

Question

10. ( am 1 ec(Use the following data to answers questions 7-11)0 he contingency table below provides frequencies for the classification of students under the age of 22, nd those 22 years of age or older. Age Group Classification Total So 150 50 200 JR SR 150 300 450 Under 22 years Old 22 years or older Tota 200 150 350 500 500 1000 7. What is the probability that a student is JR (05)? 8. What is the probability that a student is SR and is under 22 years old (5)? 9. What is the probability that a student is JR or 22 years or older (5)? 10. If you only refer to the SR (not all students), what is the probability that a student is under 22 years old (5)? What is the probability that a student is not a SR (5)?

Explanation / Answer

7) P(Junior )=350/1000=0.35

8)P(SR and under 22) =150/1000 =0.15

9) P(JR or 22 Year r more ) =(500+350-150)/1000 =0.7

10)P(under 22|SR )=150/450 =1/3 =0.3333

11) P(Not SR) =1-P(SR) =1-450/1000 =1-0.45 =0.55

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