Answer:
option A is correct.(Every plane must have three intercepts.)
Step-by-step explanation:
" Three-dimensional space (also: 3-space or, rarely, tri-dimensional space) is a geometric setting in which three values (called parameters) are required to determine the position of an element (i.e., point). This is the informal meaning of the term dimension "
The intercept form of the equation of plane in 3-D is given by:

Where l,m,n are intercepts of x,y,z axes and a plane respectively.
Hence, we require all the three intercepts of a every plane.
Hence, option A is correct.
3) 7.67 x 10 ^-2
4) 3.3 x 10 ^3
Answer is C.
The sample is selected at tandon from the population, but it was done on a particular day of the week. So the sample is not random.
More data should be taken, distributed on every day of the week, probably in different months.
It is B) -1/2 you btw you don't have to put please help :)