The percent distribution of a person's accumulating specific amounts of credit card charges over a 12-month period is shown in the pie chart. Find each probability.
Credit Card Charges
Under $100 35%
$100-$499 19%
$500-5999 12%
S1000-$1999 12%
$2000-$2999 8%
S3000-$4999 6%
$5000-99999 7%
$10.000 or more 1%
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a. What is the probability that a person's total charges are $500 or more?
(Type an integer or a Lecimal.)

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9

There were 25 students who answered to a survey about sports. four-fifths of them like football. how many students like football?