Subtract the balance from the original amount:
15 - 12.34 = 2.66
Now divide the amount spent by price per minute:
2.66 / 0.19 = 14
The call lasted 14 minutes.
A 99% confidence interval for the population mean of high school students that take the bus to school every day is b) ci=(44.34%, 54.43%)
We need to find the 99% confidence interval for the population mean of high school students that take the bus to school everyday
A confidence interval is a range of estimates for an unknown parameter. The confidence interval is calculated at the specified confidence level; the most common is the 95% confidence level, but sometimes other levels are used, such as 90% or 99%.
The confidence interval of proportions is given by:
π ± z √(π (1-π) /n)
π is the sample proportion.
z is the critical value.
n is the sample size.
For 99% confidence interval the value of z is 2.58
π = 321/650
The confidence interval is given by
=321/650 ± 2.58 √( (321/650) × [ 1 - (321/650) ] ÷ 650)
= (0.493846 ± 0.050594)
=(0.4434 , 0.5443)
=(44.34 % , 54.43 %)
Hence a 99% confidence interval for the population mean of high school students that take the bus to school every day is ci=(44.34%, 54.43%)
<u>Learn more about confidence interval:</u>
brainly.com/question/28052710
# SPJ4
A) No, because 62 + 9 = 122
Answer:
59274 ft ( the difference between the 2 points)
Step-by-step explanation:
Mount Everest peak = 29,028 ft above sea level ↑
Atlantic Ocean depth= 30,246 ft below sea level↓
as one is going above the level and one is going below (both in the opposite direction) from that level so in order to find the difference we will add both
29,028 +30,246 ft = 59274 ft ( the difference between the 2 points)
For the first one. distribute and multiply the b to the other b. the -4 to the b and the -2 and the -4 to the to. it’s really easy just distribute each variable to every value
