Answer:
4099
Explanation:
we have mean = 4000
σ = 60 units
lets make X = weekly production
z = X-μ/σ
z = X-4000/60
At 0.05 level of signficance, z critical value = 1.645
we put this value into the equation
[tex]z = \frac{x-4000}{60} \\1.645 = \frac{x-4000}{60}[/tex]
we cross multiply from here
60 * 1.645 = x - 4000
98.7 = x-4000
x = 4000 + 98.7
x = 4098.7
≈ 4099
the bonus would be paid on 4099 units