Question

Or a population, N = 10,000, μ = 121, and σ = 21. Find to 2 decimal places the z value for

Answer 1

Answer:

The z value is - 2.88

Step-by-step explanation:

The formula of the z-score of a population is z = (x¯ - μ)/(σ/$\sqrt{n}$)

The given in the problem is:

• μ = 121
• σ = 21
• x¯ = 112.35
• n = 49

Let us substitute all of these values in the rule above

$z=\frac{112.35-121}{\frac{21}{\sqrt{49}}}$

Simplify up and down

$z=\frac{-8.65}{\frac{21}{7}}$

$z=\frac{-8.65}{3}$

z = - 2.883333

Round it to 2 decimal places

∴ z = - 2.88

The z value is - 2.88