Answer:
Option (b) 36.7
Step-by-step explanation:
Data provided in the question:
Treatment 1 Treatment 2 Treatment 3 Treatment 4
Sample Size 50 18 10 17
Sample Mean 32 36 42 48
Now,
The overall mean is calculated as
= ![\frac{\sum_{i = 1}^{4} n_i X_i}{\sum_{i = 1}^{4} {n_i}}](https://tex.z-dn.net/?f=%5Cfrac%7B%5Csum_%7Bi%20%3D%201%7D%5E%7B4%7D%20n_i%20X_i%7D%7B%5Csum_%7Bi%20%3D%201%7D%5E%7B4%7D%20%7Bn_i%7D%7D)
Here, Xi = Sample mean
n = sample sizes
Thus,
Overall mean
= [ (50 × 32) + (18 × 36) + (10 × 42) + (17 × 48) ] ÷ [ 50 + 18 + 10 + 17 ]
= [ 1600 + 648 + 420 + 816 ] ÷ 95
= 36.67 ≈ 36.7
hence,
Option (b) 36.7
Answer: The number of child tickets is 85 and the number of adult tickets is 95.
Step-by-step explanation:
Let C = Number of child tickets
A = Number of adult tickets.
As per given, we have
C+A=180 (i)
7C+13A=1830 (ii)
Multiply 7 to both sides of equation (ii), we get
7C+7A=1260 (iii)
Eliminate (iii) from (ii) , we get
![6A=570\\\\\Rightarrow\ A=95](https://tex.z-dn.net/?f=6A%3D570%5C%5C%5C%5C%5CRightarrow%5C%20A%3D95)
Put value of y in (i), we get
C= 85
Hence, the number of child tickets is 85 and the number of adult tickets is 95.
Answer:
66
Step-by-step explanation:
50% = 1/2
33 x 2 = 66
-(26) - 3y = 4
-3y = 30
y = -10