Answer:
82
Step-by-step explanation:
Given that the population mean μ=86 and standard deviation σ=4 then one standard deviation below the mean means 4 less than 86 which is 82.
or
One standard deviation below the mean means z=-1 where z* is the z*score value in the standard normal distribution
Apply the formula
z=(x-μ)/σ
where x=Alice's score
μ=estimate mean
σ=standard deviation
z=(x-μ)/σ
-1=(x-86)/4----------------cross multiply
-1*4=x-86
-4=x-86
-4+86=x
82=x
