the life of a certain model of phone is normally distributed with an average of 30 months and a standard deviation of 6 months.  In a sample of 65 phones, what is the approximate number that last between 28 months and 34 months?

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 5.8…

A: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 5.8…

Q: Suppose a small paint manufacturing company has a daily production that is normally distributed with…

A: Solution: It is given that a small paint manufacturing company has a daily production that is…

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 13.4…

A: The z-value is obtained Excel function “=NORMSINV(Probability)”. Output obtained from Excel is given…

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 3.9…

A: Refer Standard normal table/Z-table, Lookup for z-score corresponding to area 0.08 to the left of…

Q: Suppose that weights of 3200 registered female great Danes in the United States are distributed…

A: Using normalised probability and z table

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 11.4…

A: Given, Mean = μ=11.4SD = σ=2.3Probability=0.02

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 12.5…

A:

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 11.3…

A: Let "X" be the shortest lifespan of the item in years. Refer Standard normal table/Z-table,…

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 14.1…

A:

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 7.8…

A: Let us denote X= life span Given that X follows a normal distribution with mean= 7.8 years and…

Q: determine the percent of batteries that can be expected to require repair or replacement under…

A: Let X be the random variable that breakdown times. Given that, X ~ N(μ=50, σ=6) The warranty on a…

Q: Suppose that the duration of a particular type of criminal trial is known to be normally distributed…

A:

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 5.7…

A: 3.3Explanation:To find the answer to this problem, we need to find the corresponding z-score of the…

Q: ppose the amount of time students take to complete the final programming assignment in a computer…

A:

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 6.1…

A:

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 11.2…

A: Let "X" be the shortest lifespan of an item. Find z-score (z): Refer Standard normal…

Q: manufacturer knows that their items have a normally distributed lifespan, with a mean of 8.9 years,…

A: Given information: Let X be the number of years. X~Nμ=8.9, σ=1.8 Let x1 be the number of years for…

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 2.3…

A: Let "X" be the shortest lifespan of the items. Refer Standard normal table/Z-table, Lookup for…

Q: Suppose that the lifetimes of light bulbs are approximately normally distributed, with a mean of 56…

A:

Q: The amount of time a certain brand of light bulb lasts is normally distribued with a mean of 1500…

A:

Q: manufacturer knows that their items have a normally distributed lifespan, with a mean of 13.1 years,…

A:

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 3.1…

A: Let us denote X=lifespan  Given that X follows a normal distribution with mean=3.1 and standard…

Q: Out of a total of 10 college books estimate the standard deviation of their ages if the oldest…

A: Introduction: The minimum age of a textbook is 1.3 years. The maximum age of a textbook is 7.9…

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 6.7…

A: Let "X" be the lifespan of an item. Draw the normal curve and shade the area of 0.02 to the left…

Q: Assume that infants begin crawling at an average age of 8.8 months with a standard deviation of 1.4…

A:

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 11.6…

A: Solution: Let X be the lifespan. From the given information, X follows normal distribution with a…

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 12.4…

A: The provided information is: Meanμ=12.40 Standard deviationσ=3.30   Consider that X is a random…

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 11.9…

A:

Q: The times of first failure of a unit of a brand of ink jet printers are approximately normally…

A: Given that  μ=1500σ=200

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 8.9…

A:

Q: Find the standard deviation of these battery lifetimes, if 90% of these batteries do not achieve a…

A: Here given ,  The lifetimes of a certain brand of battery are assumed to be normally distributed…

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 10.7…

A: Let X denote the lifespan of items and it follows normal distribution with a mean of μ=10.7 years,…

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 7.6…

A:

Q: Suppose that the probability density function of X is 3x 0<x<1 elsewhere Determine the P (X<1/3), P…

A: Since you have asked multiple questions, we will solve first question for you. If you want any…

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 14.7…

A:

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 7 years,…

A: From the provided information, Mean (µ) = 7 years Standard deviation (σ) = 1.9 years X~N (7, 1.9) X…

Q: A manufacturer knows that their items have a normally distributed lifespan, with a m standard…

A: The z score can be calculated as: z=x-μσ The required z score that is associated with the shortest…

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.