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We are sampling from the population that follows a normal distribution with mean and variance 3.3.We want to make the sampling error less that 0.4

We are sampling from the population that follows a normal distribution with mean and variance 3.3.We want to make the sampling error less that 0.4 with 80% confidence. How many sample size do we need?

a.413

b.56

c.34

d.4

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