Answers
a) The correct option is D
μx̄ = 61
σx̄ = σ / √n = 2 / sqrt(16) = 0.5
b) The correct option is A
μx̄ = 61
σx̄ = σ / √n = 2 / sqrt(16) = 0.5
c)
Since μ = 61 and σ = 2 we have: 57-61 X-μ 62-61 P(57 < X < 62 ) = P (57-61 <X-μ<62-61 ) = P < くー Since Z = z-μ , 57-61--2 and 62-61 = 0.5 we have: P(57 < X < 62 ) = P (-2<Z<0.5) Step 3: Use the standard normal table to conclude that P(-2<Z<0.5)=0.6687
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