Question
In: Statistics and Probability
1. Assume that 13% of people are left-handed. Suppose 8 people are selected at random. Answer...
1. Assume that 13% of people are left-handed. Suppose 8 people are selected at random. Answer each question about right-handers below.
a) Find the mean and standard deviation of the number of right-handers in the group.
b) What's the probability that they're not all right-handed?
c) What's the probability that there are no more than 5 righties?
d) What's the probability that the majority is right-handed?
2. A certain tennis player makes a successful first serve 64% of the time. Assume that each serve is independent of the others. If she serves 9 times, what's the probability she gets
a) all 9 serves in?
b) exactly 8 serves in?
c) at least 7 serves in?
d) no more than 4 serves in?
Solutions
thank you
orchestra answered 2 years agoRelated Solutions
Approximately 13% of the population are left-handed. If three people are randomly selected, what is the...
Approximately 13% of the population are left-handed.
If three people are randomly selected, what is the probability
that all are left- handed? (round to 4
decimal places)
If three people are randomly selected, what is the probability
that at least 1 person is not left handed?
(round to 4 decimal places)
Notice that these two events are complementary (the
probabilities do add up to 1).
1. Assume that 7% of people are left-handed. If we select 5 people at random, find...
1. Assume that 7% of people are left-handed. If we select 5
people at random, find the probability of each outcome described
below, rounded to four decimal places: a. There are some lefties (
≥ 1) among the 5 people. b. There are exactly 3 lefties in the
group. c. There are at least 4 lefties in the group. d. There are
no more than 2 lefties in the group. e. How many lefties do you
expect? f. With what...
Assume that 73% of people are left-handed. If we select 5 people at random, find the...
Assume that 73% of people are left-handed. If we select 5 people
at random, find the probability of each outcome described below,
rounded to four decimal places:
a. There are some lefties (≥ 1) among the 5 people.
b. There are exactly 3 lefties in the group.
c. There are at least 4 lefties in the group.
d. There are no more than 2 lefties in the group.
e. How many lefties do you expect?
f. With what standard deviation?
Assume that 37% of people are left-handed. If we select 5 people at random, find the...
Assume that 37% of people are left-handed. If we select 5 people
at random, find the probability of each outcome described below,
rounded to four decimal places: a. There are some lefties ( ≥ 1)
among the 5 people. b. There are exactly 3 lefties in the group. c.
There are at least 4 lefties in the group. d. There are no more
than 2 lefties in the group. e. How many lefties do you expect? f.
With what standard...
Assume that 51% of people are left-handed. If we select 5 people at random, find the...
Assume that 51% of people are left-handed. If we select 5 people
at random, find the probability of each outcome described below,
rounded to four decimal places:
a. There are some lefties (≥ 1) among the 5 people.
b. There are exactly 3 lefties in the group.
c. There are at least 4 lefties in the group.
d. There are no more than 2 lefties in the group.
e. How many lefties do you expect?
f. With what standard deviation?
Assume that 57% of people are left-handed. If we select 5 people at random, find the...
Assume that 57% of people are left-handed. If we select 5 people
at random, find the probability of each outcome described below,
rounded to four decimal places:
a. There are some lefties (≥ 1) among the 5 people.
b. There are exactly 3 lefties in the group.
c. There are at least 4 lefties in the group.
d. There are no more than 2 lefties in the group.
e. How many lefties do you expect?
f. With what standard deviation?
Assume that 41% of people are left-handed. If we select 5 people at random, find the...
Assume that 41% of people are left-handed. If we select 5 people
at random, find the probability of each outcome described below,
rounded to four decimal places:
a. There are some lefties (≥ 1) among the 5 people.
b. There are exactly 3 lefties in the group.
c. There are at least 4 lefties in the group.
d. There are no more than 2 lefties in the group.
e. How many lefties do you expect?
f. With what standard deviation?
Assume that 74% of people are left-handed. If we select 5 people at random, find the...
Assume that 74% of people are left-handed. If we select 5 people
at random, find the probability of each outcome described below,
rounded to four decimal places:
a. There are some lefties (≥ 1) among the 5 people.
b. There are exactly 3 lefties in the group.
c. There are at least 4 lefties in the group.
d. There are no more than 2 lefties in the group.
e. How many lefties do you expect?
f. With what standard deviation?
Assume that 80% of people are left-handed. If we select 5 people at random, find the...
Assume that 80% of people are left-handed. If we select 5 people
at random, find the probability of each outcome described below,
rounded to four decimal places:
a. There are some lefties (≥ 1) among the 5 people.
b. There are exactly 3 lefties in the group.
c. There are at least 4 lefties in the group.
d. There are no more than 2 lefties in the group
. e. How many lefties do you expect?
f. With what standard...
The true percentage of left-handed people is 13% (p = .13) 1) a. If we survey...
The true percentage of left-handed people is 13% (p = .13)
1) a. If we survey two hundred people, how many left handers do
you expect to survey?
b. If you repeat this survey, will you always get this number of
left-handers (the
expectation)? Why or why not?
c. What is the spread (standard deviation) of the sample
proportions?
d. Use the empirical rule to describe where we expect sample
proportions to lie if we
repeated this survey (with size...
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