Answer:
1.344
Step-by-step explanation:
Given that:
n=49,σ = 4.8
Zcritical = 95%
Using the relation :
Margin of Error = Zcritical * sqrt(σ² / n)
Zcritical at 95% = 1.96
Margin of Error = 1.96 * sqrt(4.8² / 49)
Margin of Error = 1.96 * (4.8 / 7)
Margin of Error = 1.96 * 0.6857142
Margin of Error = 1.344
