Answer:
its u=(-2,1)
Step-by-step explanation:
Reshma's age = x
Reshma = x + 5
Reshma's father= 3x + 5
x + 5 + 3x + 5 = 70
4x + 10 = 70
4 x = 60
x = 15
So Reshma's age currently is 15 and 3(15), which is 45, is her father's age.
Answer:
Option a
Step-by-step explanation:
Given two normal distribution samples
I group has 106 as mean and 8.5 as std deviation with sample size = 60
II group has 121 as mean and 6.3 as std deviation with sample size =38
We find mean difference =-15
For margin of error finding, we have to find the combined std error for the difference
Variance of difference = Sum of variances
STd error for difference = 1.50
Hence for 99% margin of error =2.58(1.50)
= 3.87
Answer:
B.71%
Step-by-step explanation:
Weighted Mean is (All X * W)/sum of W
X for averages and w for weight
X W (X*W)
HW 95 10 980
Quiz 80 20 1600
Test 67 50 3350
Final 60 20 1200
Total 100 7100
Weighted Mean = 7100/100 = 71%