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:
X^3 + y^3 = (x + y)(x^2 - xy +’y^2)
X^2 + y^2 = (x+y)^2 - 2xy
So
X3 +y^3 = 212((212^2-2(27)-27))
= 212(46983)
= 9,960,396
Answer:
Step-by-step explanation: