Question

A survey of adults found that 56% of those who text on a cell phone receive unwanted spam and messages. You randomly pick 100 adults who text on a cell phone. Find the probability that the number of people who received spam and unwanted messages is exactly 60.

Answer #1

Decide whether you can use the normal distribution to
approximate the binomial distribution. If you can, use the normal
distribution to approximate the indicated probabilities and sketch
their graphs. If you cannot, explain why and use the binomial
distribution to find the indicated probabilities.
A survey of adults found that 56% of those who text on cell
phones receive spam or unwanted messages. You randomly select 100
adults who text on cell phones.
a-Find the probability that the number of...

Decide whether you can use the normal distribution to
approximate the binomials distribution. If you can, use the normal
distribution to approximate the indicated probabilities and sketch
their graphs. If you cannot, explain why and use the binomial
distribution to find the indicated probabilities.
A surgery of adults found that 74% of those who text on cell
phones receive spam or unwanted messages. You randomly select 100
adults who text on cell phones. Complete parts (a) through (d).
Determine whether...

Decide whether you can use the normal distribution to
approximate the binomial distribution. If you can, use the normal
distribution to approximate the indicated probabilities and sketch
their graphs. If you cannot, explain why and use the binomial
distribution to find the indicated probabilities. A survey of
adults found that 79% of those who text on cell phones receive
spam or unwanted messages. You randomly select 100 adults who text
on cell phones. Complete parts (a) through (d).
Determine whether...

A national survey found that 56% of adults ages 25-29 had only
a cell phone and no landline. Suppose that three 25-29-year-olds
are randomly selected. Complete parts a through c below.
a) What is the probability that all of these adults have only a
cell phone and no landline? (Round to four decimal places as
needed.)
b) What is the probability that none of these adults have only a
cell phone and no landline? (Round to four decimal places as...

(1 point) In 2012, the percentage of cell phone owners who used
their cell phone to send or receive text messages was 80%. A
polling firm contacted a simple random sample of 1400 people chosen
from the population of cell phone owners. If p is the
proportion of cell phone owners who used their phone to text, then
what was the the probability that p^ was between 0.79 and
0.81?

a
national survey found that 46% of adults ages 25-29 had only a cell
phone and no landlines. Supposed that four 25-29 years olds are
randomly selected. What is the probability that at least one of
these adults has only a cell phone and no landline?

A recent survey found that 72% of all adults over 50 own cell
phones. You randomly select 43 adults over 50, and ask if he or she
owns a cell phone. Find the mean number of cell phones owned by a
sample of 43 adults over 50 years old. Round to two decimal
places

A random sample of n=755 us cell phone users 18 and older in may
2011 found that the average number of text messages sent and
received per day is 41.5 messages, with standard error about
6.1
Find a 95% confidence interval for the mean number of text
messages.
The 95% confidence interval is what to what?

A survey of 1000 drivers found that 29% of the people send text
messages while driving. Last year, a survey of 1000 drivers found
that 17% of those sent text messages while driving.
1.) Give a 95% confidence interval for the increase in text
messaging while driving.
2.) At α = .0 5 , can we conclude that there has been an
increase in the number of drivers who text while driving? State the
hypotheses, find the test statistic,...

A survey of drivers in the United States found that 15% never
use a cell phone while driving. Suppose that drivers arrive at
random at an auto inspection station.
If the inspector checks 10 drivers, what is the probability that
at least one driver never uses a cell phone while driving? (Round
your answer to the hundredth.)
Suppose the inspector checks 1000 drivers. Use the normal
approximation to the binomial distribution to find the approximate
probability that at least 13%...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 51 minutes ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 3 hours ago

asked 3 hours ago

asked 3 hours ago

asked 3 hours ago

asked 3 hours ago

asked 3 hours ago