Answer:
Lower limit = 0.76
Upper limit = 0.84
Step-by-step explanation:
We are given the following in the question:
Sample size, n = 350
Number of drivers that buckle = 280
Formula:


The standard deviation for sp =

95% Confidence Interval:


Putting the values, we get,

Lower limit = 0.76
Upper limit = 0.84
You would take your number, let's use 55, and multiply it by 0.35.
55 x 0.35 = 20.25
Then add that answer to your original number.
55 + 20.25 = 75.25
Your answer is 17.25.
Answer:
and
.
Step-by-step explanation:
Start by adding 1 to both sides of this equation.
.
The square of what number or numbers will lead to the number "1"? It turns out that not only
, but
as well. In other words, the value
can be either 1 or -1. Either way, the equation is still going to hold. That's the reason why there are two solutions to this equation.
Consider the case when
. Add 10 to both sides of the equation.
.
Now, consider the case when
. Again, add 10 to both sides of the equation,
.
Order the two solutions in an increasing order:
,
.