What’s the answer or is a write ur self answer so I can help !
Answer:

Step-by-step explanation:
<em>Look at the picture.</em>
<em />
We have:

Therefore
<em>divide both sides by 2</em>

Answer:
no
Step-by-step explanation:
Example:
- 9 is an odd number, but 9 can be divided by 3, so 9 is not a prime number.
- 49 is an odd number, but 49 can be divided by 7, so 49 is not a prime number.
Answer:
0.7698
Step-by-step explanation:
If you call your random variable
, then what you are looking for is

because you want the probability of
being <em>between 87 and 123.</em>
We need a table with of the normal distribution. But we can only find the table with
and
. Because of that, first we need to <em>normalize </em>our random variable:

(you can always normalize your variable following the same formula!)
now we can do something similar to our limits, to get a better expression:


And we transform our problem to a simpler one:
(see Figure 1)
From our table we can see that
(this is represented in figure 2).
Remember that the whole area below the curve is exactly 1. So we can conclude that
(because 0.8849 + 0.1151 = 1). We also know the normal distribution is symmetric, then
.
FINALLY:

0.625 is the answer hope that hepled