Answer:
The value is 
Step-by-step explanation:
From the question we are told that
The sample size is n = 20
The sample mean is 
The standard deviation is 
Generally the standard error of the mean is mathematically represented as

=> 
=> 
Solve the equation = a/4+a/3=21
a=36
J = g + 10
j + g = 27
g + 10 + g = 27
2q + 10 = 27
2q = 27 - 10
2q = 17
g = 17/2
g = 8.50 <=== Gail has $ 8.50
j = g + 10
j = 8.50 + 10
j = 18.50....Jim has $ 18.50
Answer:
.7881
Step-by-step explanation: