Jeffery typed 110 words in 2 3/4 minutes. at this rate, how many words can he type in 4 1/4 minutes

change the mixed numbers to improper factions

2 3/4 = (4*2+3)/4  = 11/4

4 1/4 = (4*4+1) /4 = 17/4

110 divided by 11/4

copy dot flip

110 * 4/11 = 40 words per minute

40 word per minute * 17/4 minutes

170 words

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;

when the daily mileage is greater than 40 miles, unlimited mileage plan will save you money. 40 miles is the break-even point.

step-by-step explanation: