Answer: 151
Step-by-step explanation:
if prior population proportion is unknown , then the formula is used to find the sample size :
, where 
= Two tailed critical value for significance level of 
E = Margin of error.
Given : margin of error = 8%= .08
For 95% confidence level , two tailed critical value = 1.96
Now, the required sample size :
Hence, the size of the sample needed = 151.
1. you have a 50 50 chance
2. 4/52 chance
Reason
1. coins only have two sides
2. there are 4 kings in a deck of 52 cards
Answer:
x-intercept: The plumber drained all the water out after 9 hours.
Relative maximum or minimum: The amount of water reached 70 liters before the draining began.
Increasing or decreasing interval: Over the first 5 hours, the leak just got bigger and bigger.
Step-by-step explanation:
W(t) is the amount of water in the basement. When W(t) = 0, there is no water in the basement. When W(t) = 0, W(t) is a x-intercept. So, x-intercept: The plumber drained all the water out after 9 hours.
The water level gets to a relative maximum after about 5 hours, when the water reaches about 70 liters. So, relative maximum or minimum: The amount of water reached 70 liters before the draining began.
The water level keeps increasing until the relative maximum. That is at 5 hours when the water level is 70 liters. After that point, the water level decreases as the water is being drained until the water level is 0 at 9 hours. So, the increasing or decreasing interval: Over the first 5 hours, the leak just got bigger and bigger.
Hope this helps!
