Answer: 68
Step-by-step explanation:
Answer:


Step-by-step explanation:
Given
---- proportion of watches with defects
--- Number of watches
Solving (a): Represent at least 215 of 400 are defective
In inequalities, at least means: 
So, the probability is represented as: 
Solving (b): Calculate 
Normal or Poisson: Normal distribution is characterized by 2 parameters
and
.
These two parameters can be easily calculated from the given parameters in the question. So, we solve using normal distribution
Start by calculating the mean



Calculate standard deviation





By continuity correction, we have:



So, we have:

Calculating
, we have:

Calculate z score




So, we have:

Using the z score probability table, we have:

So, we have:


Answer:

Step-by-step explanation:
This is a difference of squares that has the form and factors to:

Here take the square root of each term for the factors.

Answer:
5 pack notebook
Step-by-step explanation:
5 pack notebook costs more because the 4 pack notebook costs 4 dollars w/ 2 cents off, and 5 pack notebook costs 5 dollars and with 1 cent of, so if ir increase by 1 dollar, than probably the 5 pack costs more. It is not about how many, but how much dollars are for per/ notebook.
14- 63b is the answer :))))))))