The sum of an irrational number and a rational one
is always irrational. There's nothing you can add to
an irrational number to make it behave better.
Recall that for 
, we have
Replace 
with 
and we get
Lastly, multiply this by 
, so that
It is 19. Hope this helps!!
Answer:
An invoice was paid an average of 20 days after it was received.
Mean =
Standard deviation =
Now we are supposed to find what percent of the invoices were paid within 15 days of receipt i.e.P(x<15)
Formula :
At x = 15
Substitute the values
Refer the z table for p value
So, p value = 0.1587
So, 15.87% of the invoices were paid within 15 days of receipt
Step-by-step explanation:
(14 over 5) · (15 over 5)
= 14·13·12·11·10/5! · 15·14·13·12·11/5!
= 6012006
(n over k) is the Binomial coefficient
