Homework Help

Desite its name, Zippy Pizza delivers only 40% of its pizzas on time. a) What is the...

user profile pic

zofic13 | Student, Grade 11 | Salutatorian

Posted December 4, 2012 at 10:50 PM via web

dislike 0 like

Desite its name, Zippy Pizza delivers only 40% of its pizzas on time.

a) What is the probability that its first four deliveries will be late on any ..

given day?

b) What is the expectd number of pizza deliveries before one is on time?

Explain please.

Tagged with data, math, probability

1 Answer | Add Yours

user profile pic

samhouston | Middle School Teacher | (Level 1) Associate Educator

Posted December 4, 2012 at 11:29 PM (Answer #1)

dislike 1 like

If 40% of the pizzas arrive on time, then 60% of the pizzas will be late. 

Change the percent to a decimal:  60% = 0.6

Four late pizzas in a row = 0.6^4 = 0.1296

a)  The probability that the first four deliveries will be late is 12.96%.

b)  40% of the pizzas arrive on time.  40% is equal to 2/5.  Therefore, it is expected the first and second pizzas will be late, and the third pizza will be on time.

Join to answer this question

Join a community of thousands of dedicated teachers and students.

Join eNotes