All I can say is that your equation is wrong
Total Numbers = 5
Mean (Average) = 85.2
Standard deviation = 10.70981
Variance(Standard deviation) = 114.7
Population Standard deviation = 9.57914
Variance(Population Standard deviation) = 91.76
Answer:
x=15
Step-by-step explanation:
t=30
30+30=60
120-60=60
4x = 60
60/4 = 15
x=15
