Answer:
10
Step-by-step explanation:
40=2a<u>-3</u>+2a+3a<u>+1</u>
add like terms
get 'a' by its self
- 40(+2)=7a<u>-2(+2)</u> [2 cancels out]
- 42(÷7)=7a(÷7) [7 cancels out]
- a=6
plug in the answer for Equations
- biggest: 3(6)+1= 18+1= 19
- smallest: 2(6)-3= 12-3=9
subtract smallest from biggest
Answer: 90% confidence interval is (25.8,30.2).
Step-by-step explanation:
Since we have given that
n = 5
Mean = 28
Standard deviation = 3
It is a 90% confidence interval , so, z = 1.64
We need to find the interval.
so, it would be
Hence, 90% confidence interval is (25.8,30.2).
This needs more information but I suppose you would multiply by 5 on both sides so 5(5):5( 1) = 25:5