3 years ago

SEE QUESTION IN IMAGE

Mathematics

1 answer:

shepuryov [24]3 years ago

6 0

Answer:

<u>Required probability:</u>

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

<u>Required probability:</u>

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

<u>At least 2 students pass:</u>

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

<u>Number of x's:</u>

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

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