. A students received a score of 50 on his history test. The test had a mean of 69 and a standard deviation of 10. Find the z score and assess whether his score is considered unusual.

1.90; unusual

–1.90; not unusual

–1.90; unusual

1.90; not unusual

c) The Z-score = - 1.90 unusual

Step-by-step 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

constants mean the stopped points or the points on a graph that nothing is changing, hope this

step-by-step explanation:

(-5,-28)

i graphed to on desmos.