Answer:
48
Step-by-step explanation:
21 white tiles = 63 cm2
total number is 144
144-63 = 81
81/3 = 27
so 27 black tiles
21+27 = 48 total.
Answer:
C)
Step-by-step explanation:
Just see the length of the R line, A and B are almost the same large when you add them.
Answer: no solution
Step-by-step explanation:
Answer: 
Step-by-step explanation:
Given : Population mean : 
Standard deviation : 
Sample size : n=35
Significance level : 
Critical value = 
The confidence interval for sample mean is given by :-

i.e. 

Hence, the required interval= 