During the first hour a store is open, twenty customers enter the store. The store has regular checkout
lanes for any number of items and a quick-check lane for customers with 10 items or less. From store
records, the probability that a randomly chosen customer purchases more than ten items is 0.75.
Assume that each customer shops independently of each other.

a. What is the probability the all twenty customers purchase more than 10 items so the quick-check
lane will not be needed?

b. What is the probability at least one customer purchases 10 items or less, so the quick-check lane
will be needed?

walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40

4 and 5)16.97 or 12√2

6)15.59 or 9√3

7)y = 15.59 or 9√3     x =27

8)17.80

step-by-step explanation :

we know that

the measurement of the outer angle is the semi-difference of the arcs which comprises

in this problem

m< xzy is the outer angle

substitute the values

the measure of angle xoy is equal to

> by central angle

substitute the value

answer is because 4×10=40

and 98×4= is 392

40,392