1.
The common time to run the 5K enjoyable run is 24 minutes and the usual deviation is 2.2 minutes. 48 runners are randomly chosen to run the 5K enjoyable run. Spherical all solutions to four decimal locations the place doable and assume a standard distribution.
a. What’s the distribution of XX? XX ~ N(,)
b. What’s the distribution of ¯xx¯? ¯xx¯ ~ N(,)
c. What’s the distribution of ∑x∑x? ∑x∑x ~ N(,)
d. If one randomly chosen runner is timed, discover the likelihood that this runner’s time will likely be between 24.1237 and 24.5237 minutes.
e. For the 48 runners, discover the likelihood that their common time is between 24.1237 and 24.5237 minutes.
2.
Every sweat store employee at a pc manufacturing facility can put collectively 5 computer systems per hour on common with a normal deviation of zero.eight computer systems. 50 employees are randomly chosen to work the following shift on the manufacturing facility. Spherical all solutions to four decimal locations the place doable and assume a standard distribution.
a. What’s the distribution of XX? XX ~ N(,)
b. What’s the distribution of ¯xx¯? ¯xx¯ ~ N(,)
c. What’s the distribution of ∑x∑x? ∑x∑x ~ N(,)
d. If one randomly chosen employee is noticed, discover the likelihood that this employee will put collectively between four.9 and 5 computer systems per hour.
e. For the 50 employees, discover the likelihood that their common variety of computer systems put collectively per hour is between four.9 and 5.
f. Discover the likelihood 50 individual shift will put collectively between 240 and 245 computer systems per hour.
g. For half e) and f), is the idea of regular crucial? YesNo
h. A sticker that claims “Nice Dedication” will likely be given to the teams of 50 employees who’ve the highest 10% productiveness. What’s the least whole variety of computer systems produced by a bunch that receives a sticker? computer systems per hour (spherical to the closest pc)
i. Discover the likelihood that the randomly chosen 48 individual staff could have a complete time greater than 1132.eight.
j. For half e) and f), is the idea of regular crucial? NoYes
ok. The highest 15% of all 48 individual staff relay races will compete within the championship spherical. These are the 15% lowest instances. What’s the longest whole time relay staff can have and nonetheless make it to the championship spherical? minutes.
three. Suppose that the period of time that college students spend learning within the library in a single sitting is generally distributed with imply 46 minutes and commonplace deviation 21 minutes. A researcher noticed 6 college students who entered the library to review. Spherical all solutions to four decimal locations the place doable.
What’s the distribution of XX? XX ~ N(,)
What’s the distribution of ¯xx¯? ¯xx¯ ~ N(,)
What’s the distribution of ∑x∑x? ∑x∑x ~ N(,)
If one randomly chosen scholar is timed, discover the likelihood that this scholar’s time will likely be between 33 and 40 minutes.
For the 6 college students, discover the likelihood that their common time learning is between 33 and 40 minutes.
Discover the likelihood that the randomly chosen 6 college students could have a complete examine time greater than 324 minutes.
For half e) and f), is the idea of regular crucial? NoYes
The highest 10% of the overall examine time for teams of 6 college students will likely be given a sticker that claims “Nice dedication”. What’s the least whole time group can examine and nonetheless obtain a sticker? minutes
four.
The common sum of money that folks spend at Don Mcalds quick meals place is $7.1300 with a normal deviation of $1.7300. 11 prospects are randomly chosen. Please reply the next questions, and spherical all solutions to four decimal locations the place doable and assume a standard distribution.
What’s the distribution of XX? XX ~ N(,)
What’s the distribution of ¯xx¯? ¯xx¯ ~ N(,)
What’s the distribution of ∑x∑x? ∑x∑x ~ N(,)
What’s the likelihood that one randomly chosen buyer will spend greater than $6.3976?
For the 11 prospects, discover the likelihood that their common spent is greater than $6.3976.
Discover the likelihood that the randomly chosen 11 prospects will spend lower than $70.3736.
For half e) and f), is the idea of regular crucial? YesNo
The proprietor of Don Mcalds offers a coupon for a free sundae to the three% of all teams of 11 individuals who spend essentially the most cash. A minimum of how a lot should a bunch of 11 spend in whole to get the free sundae? $
5.
The common rating for video games performed within the NFL is 20.7 and the usual deviation is 9.2 factors. 42 video games are randomly chosen. Spherical all solutions to four decimal locations the place doable and assume a standard distribution.
What’s the distribution of ¯xx¯? ¯xx¯ ~ N(,)
What’s the distribution of ∑x∑x? ∑x∑x ~ N(,)
P(¯xx¯ < 20.3706) =
Discover the 68th percentile for the imply rating for this pattern dimension.
P(20.6706 < ¯xx¯ < 22.4098) =
Q3 for the ¯xx¯ distribution =
P(∑x∑x < 914.3652) =
For half c) and e), is the idea of regular crucial? Sure or No
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1.
The 5K enjoyable run takes a median of 24 minutes to finish, with a normal deviation of two.2 minutes. A complete of 48 runners are chosen at random to take part within the 5K enjoyable run. Spherical all solutions to four decimal locations the place doable and assume a standard distribution.
a. What’s XX’s likelihood distribution? XX N (,)
b. What’s the distribution of ¯xx¯? ¯xx¯ ~ N(,)
c. What’s the distribution of ∑x∑x? ∑x∑x ~ N(,)
d. If one randomly chosen runner is timed, discover the likelihood that this runner’s time will likely be between 24.1237 and 24.5237 minutes.
e. For the 48 runners, discover the likelihood that their common time is between 24.1237 and 24.5237 minutes.
2.
Every sweat store employee at a pc manufacturing facility can put collectively 5
