Answer:
c) The Z-score = - 1.90 unusual
Explanation:
Explanation:-
Let 'X' be the random variable in normal distribution
Given student received a score X = 50
Mean of the Population x⁻ = 69
standard deviation of the Population 'σ' = 10
now


The Z-score = - 1.90
Conclusion:-
The Z-score = - 1.90 unusual