C) At the end of the day, the records show that 140 customers made a purchase at the store that day. What are the mean and standard deviation of the number of customers who won a discount of at
least 30%?

The right solution is "5.92". A further solution is provided below.

Explanation:

The given values are:

Total number of customer,

n = 140

The probability of 30% discount,

=

Somewhat by binomial distribution we could perhaps calculate the mean as well as the mean of the standard deviation will be:

=

=

Now,

The standard deviation will be:

=

On substituting the given values, we get

=

=

=

=

b||c; c||d; b||d

Step-by-step explanation:

Substituting 10 for x, in the angle beside b we have

7(10)-5 = 70-5 = 65

In the angle beside c we have

10(10)+15 = 100+15 = 115

In the angle beside d we have

12(10)-5 = 120-5 = 115

In the angle beside we have

8(10)-25 = 80-25 = 55

The angle beside c has a vertical angle on the other side of c.  This angle would be same-side interior angles with the angle beside b; this is because they are inside the block of lines made by b and c and on the same side of a, the transversal.  These two angles are supplementary; this is because 65+115 = 180.  Since these angles are supplementary, this means that b||c.

The angle beside c and the angle beside d would be alternate interior angles; this is because they are inside the block of lines made by c and d and on opposite sides of the transversal.  These two angles are congruent; this means that c||d.

Since b||c and c||d, by the transitive property, b||d.