Question

Supposed the top 15 percent of producers get bonuses and the average production rate is 200 units with the standard deviation of 20 what is the z score of someone who produces 240 units

Answer 1

Th z-score is given by:
z=(x-μ)/σ
where:
μ-mean
σ-standard deviation

hence:
z=(240-200)/20
z=2