SOLUTION: The amount of time spent by adults playing sports per day is normally distributed with a mean 4 hours and standard deviation of 1.25 hours.
1. Find the probability that a random
Algebra.Com
Question 1177882: The amount of time spent by adults playing sports per day is normally distributed with a mean 4 hours and standard deviation of 1.25 hours.
1. Find the probability that a randomly selected adult plays sports between 5 and 5.5 hours per day.
2.Find the third quartile of the distribution of time an adult spend in playing sports.
3.Find the probability that if four adults are randomly selected, their average number of hours spent playing sports is more than 5 hours per day
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
z=(x-mean)/sd
between 5 and 5.5 hours is a z between 1/1.25 or 0.8 and a z of 1.5/1.25=1.2
that probability for a z is 0.0968
-
third quartile-find z for 0.75 probability, and that is +0.6745
0.6745=(x-4)/1.25
so x=4.84 hours at the third quartile
-
this is a z>(5-4)/1.25/sqrt(4)
>1*2/1.25
z>1.6
probability=0.0548
RELATED QUESTIONS
The amount of time spent by adults playing sports per day is normally disturbuted with a (answered by ewatrrr)
Forty-five percent of the adults in a particular large city are women. A court is to... (answered by solver91311)
A survey was conducted to measure the number of hours per week adults spend on home... (answered by stanbon)
Question 1(a)
Suppose that the amount of time teenagers spend on the Internet is... (answered by ikleyn)
The amount of time that office workers at Company XYZ spend on the computer each workday... (answered by ewatrrr)
a research concludes that the number of hours of exercise per week for adults is normally (answered by Fombitz)
) According to a certain​ survey, adults spend
2.45
2.45 hours per day watching... (answered by Boreal)
The mean amount spent by a family of four on food per month is $500, with a standard... (answered by ewatrrr)
A random sample of 10 university students was surveyed to determine the amount of time... (answered by stanbon)