Suppose that the time it takes a student to complete an exam is a random variable that has normal distribution with mean 75 minutes and standard deviation 10 minutes. a)Find the probability that a randomly selected student will complete the exam in more than 80 minutes b)Find the probability that among 100 students who take the exam at least one will complete it in less than 65 minutes. c)What should the exam duration be such that 80% of students can complete it?

Q: According to an almanac, 60% of adult smokers started smoking before turning 18 years old. (a)…

A: Given information- Sample size, n = 300 The proportion is = 0.60 So, p = 0.60, q = 1 - p = 0.40

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Q: Suppose that the talk time on the Apple iPhone is approximately normally distributed with mean 7…

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A: Given that, A manufacturer knows that their items have a normally distributed length with, Mean =…

Q: According to an​ almanac,60​%of adult smokers started smoking before turning 18 years old.   ​(a)…

A: Given that  According to almanac  60​%of adult smokers started smoking before turning 18 years old.…

Q: Suppose that from the past experience a professor knows that the test score of a student taking his…

A: Concept of sampling distribution of sample mean: Let a particular characteristic of a population is…

Q: According to an almanac, 60% of adult smokers started smoking before turning 18 years old. (a)…

A: Given that, probability, p= 60% = 0.60 And sample size is n= 100 Hence X~ binomial (100,0.60)

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Q: suppose that 60% of all students currently enrolled at all California Community College campuses…

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Q: According to an almanac, 80% of adult smokers started smoking before turning 18 years old. (a)…

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Q: According to an almanac, 70% of adult smokers started smoking before turning 18 years old. (a)…

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Q: 2 A company manufactures floor tiles of mean length 20 cm with standard deviation 0.2 cm. Assuming…

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A: It is given that the mean is 5.8 and standard deviation is 1.3.

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A: Standard normal distribution: Let x be the continuous random variable and it said to follows normal…

Q: Suppose that the time it takes a student to complete an exam is a random variable that has normal…

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A: P(X<16)=Pz<16-15.52=P(z<0.25)=0.5987

Q: According to an almanac, 60% of adult smokers started smoking before turning 18 years old. (a)…

A:

Q: Suppose that the age of a randomly selected business major can be considered to be a random variable…

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Q: 1. The average product of all the machines in a fabrication is 12 finished materials in one hour…

A: Given  mean=μ=12, standard deviation=2, n=4,  P(X>15)=?

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.