Astudy of a company's practice regarding the payment of invoices revealed that on the average an invoice was paid 20 days after it was received. the standard deviation equaled five days. assuming that the distribution is normal, what percent of the invoices were paid within 15 days of receipt?

15.87%

Step-by-step explanation:

Given : A study of a company's practice regarding the payment of invoices revealed that on the average an invoice was paid 20 days after it was received.

i.e. days

days

Z-score :

Now, the probability that the invoices were paid within 15 days of receipt is given by :-

Hence, 15.87% of the invoices were paid within 15 days of receipt.

a

step-by-step explanation:

jjddbdhid r

all three statements are true

step-by-step explanation:

a shipping fee of 5% is charged online with every item purchased online

first let's just take each option and calculate them based on this, to see if the answers matched

keith buys a 40 dollar book

40 x 0.05 = 2

therefore there will be a two dollar fee on keith's book

40 + 2 =42

the first statement is true

a chair costs $80

80 x 0.05 = 4

80 + 4 = 84

the second statement is true

george buys a 20 dollar calculator

20 x 0.05 = 1

20 + 1 = 21

the third statements are true

all three statements are true