The heights of a random sample of 100 women are recorded. the sample mean is 65.3 inches and the sample standard deviation is 3 inches. whicho of the following is an approximate 95% confidence interval for the population mean? a. 65.3 + (2)(0.03)b. 65.3 + ()c. 65.3 + (2)(3)d. 65.3 + (2)(30)

B.

Step-by-step explanation:

The confidence interval for the population mean is given by :-

Given : Sample size : n= 100

Sample mean :

Standard deviation:

Level of confidence = 0.95

Significance level :

Critical value :

Then, 95% confidence interval for the population mean will be :-

step-by-step explanation:

12: 00 p.m. to 7: 00 p.m. is a total of 7 hours.

4: 00 p.m. to 7: 00 p.m. is a total of 3 hours.

this means that from 4: 00 p.m to 7: 00 p.m. this represents 3/7 of what was lost from 12: 00 p.m. to 7: 00 p.m.

after knowing this, after doing 11,600 - 6,800 = 4,800

4,800 represents 3/7 of what was lost for 7 hours.

we then divide 4,800 by 3 which gets 1,600.

because we know that 1,600 represents 1/7 of how much water was lost, we just have to multiply by 7, which gets 11,200.   after adding 11,200 to how much water was left at 7: 00 p.m. which was 6,800. 11,200 + 6,800 = 18,000

this means that the pool originally had 18,000 gallons in the pool.

you can also check your work by doing 18,000 - 4(1600), which becomes           1800 - 6400 which gets you 11,600.

it’s supposed to be -4+45=41

step-by-step explanation: