USE MINITAB IF Possible

Question 4:

Suppose that five normal populations have common variance ² = 100 and means ₁ = 175, ₂ = 190, ₃ = 160, ₄ = 200, and ₅ = 215.How many observations per population must be taken so that the probability of rejecting the hypothesis of equality of means is at least 0.95?Use = 0.05.