^Challenge^. A cell phone plan costs $27.70 per month for 800 minutes of talk time. It costs an
additional $0.05 per minute for each minute over 800 minutes. To get e-mail access, it costs 10% 0
the price for 800 minutes of talk time. Your bill, which includes e-mail, is the same each month for 7
months. The total cost for all 7 months is $234.29. Write and solve an equation to find the number
minutes of talk time you use each month.

Let m represent the number of minutes over 800 minutes each month. Which equation represents the given
situation?

A 234.29 = 7(m + 27.70)
B. 234.29 = 7(0.05m +27.70+ 0.10(27.70))
C. 234.29 = 7(m + 27.70 +0.90(27.70))
D. 234.29 = 7(0.05m +27.70)
You use _? minutes of talk time each month.?

d. 24+-0.114

step-by-step explanation:

the question requires us to calculate the approximate 95% confidence interval for the mean number of ounces of ketchup per bottle in the sample given the following statistics;

sample mean = 24

standard deviation, σ = 0.4

sample size , n = 49

the confidence interval for a population mean is calculated using the formula;

sample mean ± z-score*(σ/sqrt(n))

the z-score associated with a 95% confidence interval, from the standard normal tables, is;

1.96

substituting these values into the formula;

24 ± 1.96*(0.4/7)

= 24 ± 0.112

from the alternatives given, choice d is closest to the above expression;

answer 1 : option "c"

answer 2 : option "d"

answer 3 : option "b"

answer 4 : option "d"

answer 5 : option "b"

answer 6 : option "a"

answer 7 : option "c"

answer 8 : option "d"

answer 9 : option "c"

answer 10 : option "d"

answer 11 : option "c"

answer 12 option "b"

answer 13 option "c"

answer 14 option "c"

answer 15 option "d"

answer 16 option "a"

answer 17 option "b"

answer 18 option "c"

answer 19 option "a"

answer 20 option "a"

answer 21 option "c"

d