In a city in Italy 30% of the families have a MasterCard 20% have an American Ex

In
a city in Italy 30% of the families have a MasterCard 20% have an American
Express card and 25% have a Visa card. Eight percent of families have both a
MasterCard and an American Express card. Twelve percent have both a Visa Card
and a MasterCard. Six percent have both an American Express card and a Visa
card. a.
What is the probability of selecting a family
that has either a Visa card or an American Express card?b.
If a family has a MasterCard what is the
probability that it has a Visa card?c.
If a family has a Visa card what is the
probability it has a MasterCard?Show
all work. Question
# 2 A
National study has determined that people who work full time average 43.4 hours
worked per week.Assume
that the number of hours worked per week for those who work full time is
normally distributed. Suppose 12% of these workers work more than 48 hours.
Based on this percentage what is the standard deviation of number of hours
worked per week for those workers?