Answer:
<em>a+</em><em>b=</em><em> </em><em>5</em>
<em>a-b=</em><em> </em><em>1</em>
<em>5</em><em> </em><em>and </em><em>1</em><em> </em><em>is </em><em>the </em><em>answer</em>
Answer: Sorry to be rude but could I see the question? Thank you and when I see it I will take a look at it.
Answer: 0.345
Step-by-step explanation:
Given : The incomes of families in Newport Harbor are normally distributed with Mean :
and Standard deviation : 
Samples size : n=4
Let x be the random variable that represents the incomes of families in Newport Harbor.
The z-statistic :-

For x= $800,000

By using the standard normal distribution table , we have
The probability that the average income of these 4 families exceeds $800,000 :-

Hence, the probability that the average income of these 4 families exceeds $800,000 =0.345
24- 30 = -6 you r very welcome