Since the given coordinates are already in order,
then and two consecutive distances between the coordinates will give length and breadth,
Using distance formula,

(we'll not consider the negative value since distances can't be negative)
Applying this again on 2nd and 3rd coordinates,

(we'll not consider the negative value since distances can't be negative)
Since length's always gotta be greater than bredth
therefore,
the difference will be 5-4= 1 units
Hence width is 1 unit shorter than length.
Note: Unit used is "unit/s"
You refer to a rectangular distribution.
I.e. Area ∝ probability
so, length x height = area
=> 6 x height = 1
so, height = 1/6
Therefore, greater than 2.25 minutes => 8-2.25 = 5.75 minutes
=> 5.75 x 1/6 = 0.9583
Since this is uniformly distributed, there is no need to
find the height or standard deviation.
Solution:
Let x represent a number of calling minutes. According to the problem, we want:

now, putting the similar terms together, we obtain:

this is equivalent to:

now, solving for x, we get:

then, the correct answer for the first question is:
400 minutes is the number of minutes the two plans cost the same
now, for the second question, we can replace the above value (400 minutes) into the following equation:

so that, the correct answer for the second question is:
$55 is the cost when the two plans cost the same
Maria had 13 points and jane had 8 points