Answer:
X₀ = 71.65
Step-by-step explanation:
given,
mean (μ ) = 64
standard deviation (σ) = 9
σ² = 81
selected candidate are top 20 % candidate
P( X > X₀) = 0.2


P( Z > Z₀) = 0.2

X₀ = 71.65
Hence, the cut off score is equal to X₀ = 71.65
Answer:
hight so im not sure about the test you are talking about but its 1/2 or 0.5 both are right..
Step-by-step explanation:
Its basic math..
How can I ask questions without answering questions it’s kind of annoying
This website explains it http://users.ipfw.edu/maloney/Game%20of%20Sci/Intro%20Stud%20to%20the%20Game%20of%20Sci.pdf