Question

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Answer 1

42

Required probability:

• P(≤4) = (18 + 14 + 20 + 16)/(18 + 14 + 20 + 16 + 15 + 17) = 68/100 = 0.68

43

Required probability:

• P(>3) = (20 + 16 + 15 + 17) / (18 + 14 + 20 + 16 + 15 + 17) = 68/100 = 0.68

44

At least 2 students pass:

• P(2 or 3) = (3/5)² + (3/5)³ = 9/25 + 27/125 = 72/125 = 0.576

45

Number of x's:

• x/108 = 4/27
• x = 108*4/27
• x = 16