At a certain grocery store 65% of the customers regularly use coupons.

what is the approximate standard deviation of the sampling distribution of the proportion for

samples of size 340?

a.11.1%

b.6.7%

c.4.4%

d.2.6%

Option D 2.6% is right.

Step-by-step explanation:

Given that at a certain grocery store 65% of the customers regularly use coupons.

Proportion of  the customers regularly use coupons.=0.65

Proportion of customers who do not  regularly use coupons.

=1-0.65 = 0.35

Sample size = 340

In usual notation we write this as

Std deviation =

In percentage this can be written as 2.5867% ~2.6%

Option D 2.6% is right.

45

step-by-step explanation:

to find a percentage, add a decimal in front and multiply it by the other number.

.25 times 180= 45