Answer:
50%
Step-by-step explanation:
First, find the difference between the two values
1.8-1.2=0.6
Then divide the original value by the difference
difference/original value
0.6/1.2=0.5
0.5*100=50
So, the amount of iron increased by 50%
Hope this helped! :)
35,000 X .02 = 700, so 2% of 35,000 is 700. With that, the population would be 35,700.
Approximately 3365 students will score less than 66.
The z-score is calculated using the formula
z=(X-μ)/σ, where μ is the mean and σ is the standard deviation.
For this problem, we have
z=(66-57)/9 = 9/9 = 1.00
Using a z-table (http://www.z-table.com) we see that the area to the left of, or probability less than, this is 0.8413.
To find the number of students out of 4000 that will score in this range, we multiply this probability by 4000:
0.8413(4000) = 3365.2 ≈ 3365
