Answer:
the answer is A
Step-by-step explanation:
3 by 3 by 3 by 3 or 6 by 6 or 12
The

confidence interval of a standard deviation is given by:

Given a sample size of 31 charge sales, the degree of freedom is 30 and for 90% confidence interval,

Therefore, the 90% confidence interval for the standard deviation is given by
Answer:
D
Step-by-step explanation:
Total frequency: 3+5+8+6+2+1 = 25
P(8to11) = 8/25
Answer:
When two straight lines intersect each other at 90˚ or are perpendicular to each other at the intersection, they form the right angle. A right angle is represented by the symbol ∟. ... A square or rectangle has four corners with right angles.