Assume that adults have IQ scores that are normally distributed with a mean of 98.5 and a standard deviation 17.1. Find the first quartile Q1​, which is the IQ score separating the bottom​ 25% from the top​ 75%. (Hint: Draw a​ graph.) The first quartile is

Q: Find the indicated IQ score. The graph to the right depicts IQ scores of adults, and those scores…

A: Given,   Mean = 100 Standard deviation = 15

Q: Assume that adults have IQ scores that are normally distributed with a mean of 104.7 and a standard…

A:

Q: Assume that adults have IQ scores that are normally distributed with a mean of 101.2 and a standard…

A:

Q: Assume that adults have IQ scores that are normally distributed with a mean of 96.4 and a standard…

A: We have to find first quartile. First quartile (Q1) is the values such that 25% data fall below that…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 100.6 and a standard…

A: Let 'X' be the random variable representing IQ scores. According to the given information,…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 103.4 and a standard…

A: It is given that the mean is 103.4 and standard deviation is 21.5.

Q: ssume that adults have IQ scores that are normally distributed with a mean of 96.9 and a standard…

A: Given Information:  Mean (x)  = 96.9  Standard Deviation (s) = 23.6

Q: Assume that adults have IQ scores that are normally distributed w 21.6. Find the first quartile Q,,…

A: Given: mean=μ=95.1 standard deviation=σ=21.6

Q: Assume that adults have IQ scores that are normally distributed with a mean of 100.7 and a standard…

A:

Q: 0.2743 d.)

A: For a random variable, X~N(μ,σ2), the z-score is, Z=X-μσ    .... (1)where, μ=population…

Q: The first quartile is. (Type an integer or decimal rounded to one decimal place as needed.)

A: Assume that adults have IQ scores that are normally distributed with a mean of 100.2 and a standard…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 97.7and a standard…

A: Given that  IQ scores that are normally distributed Mean (μ) = 97.7  Standard deviation (σ) = 19.7…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 96.4 and a standard…

A: Given,Mean, μ = 96.4Standard deviation, σ = 18Using formula,

Q: Assume that adults have IQ scores that are normally distributed with a mean of 95.9  and a standard…

A: Given mean=95.9, standard deviations σ=24

Q: Find the indicated IQ score. The graph to the right depicts IQ scores of adults in those scores are…

A: Let X be the random variable for the IQ scores of adults. X~Nμ, σ Where, Mean (μ)=100Standard…

Q: Find the indicated IQ score. The graph to the right depicts IQ scores of​ adults, and those scores…

A: Let x be the IQ score which follows normal distribution with mean 100 and standard deviation 15. The…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 101.8and a standard…

A: Let X denotes the adults IQ scores which follows normal distribution with mean 101.8 and standard…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 95.1 and a standard…

A:

Q: Assume that adults have IQ scores that are normally distributed with a mean of 103.4 and a standard…

A:

Q: The prices of the tablets in a store have a mean of $735 and a standard deviation of $65. Calculate…

A: Given,   Mean = 735 Standard deviation = 65

Q: Assume that adults have IQ scores that are normally distributed with a mean of 98.4 and a standard…

A: X:adults IQ scores X has normally distributed X~N(μ,σ) Mean(μ)=98.4 and Standard deviation(σ)=20.3…

Q: Find the indicated IQ score. The graph to the right depicts IQ scores of adults, and those scores…

A:

Q: The first quartile is

A: here use standard normal distribution table for z score for 0.25

Q: Assume that adults have IQ scores that are normally distributed with a mean of 101.1 and a standard…

A: Solution: Let X be the IQ score. From the given information, X follows normal distribution with mean…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 96.3 and a standard…

A: Given :  IQ scores that are normally distributed with a mean of 96.3 and a standard deviation 17.…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 97.4 and a standard…

A: Let "X" be the IQ scores of adults. Find z-value: Refer Standard normal table/Z-table, Lookup for…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 103.2 and a standard…

A: Q1 for first quartile is that value of the distribution or data-set that separates the bottom​ 25%…

Q: Assume that adults have IQ scores that normally distributed with a mean of 99.2 and a standard…

A: Given that  X~Normal(μ=99.2 , σ=24.2) If X follows normal distribution then formula for first…

Q: the mean is 146, and standard deviation is 35. A score of 181 is how many z-scores above the mean?

A:

Q: Assume that adults have IQ scores that are normally distributed with a mean of 101 and a standard…

A: Solution-: Given: μ=101,σ=20.3 We want to find Q1=?

Q: Find the indicated IQ score. The graph to the right depicts IQ scores of adults, and those scores…

A: From the given information, μ=100σ=15 From the given plot, PX>x=0.1026

Q: Assume that adults have IQ scores that are normally distributed with a mean of 96.6 and a standard…

A: Given,μ=96.6σ=19 First quartile, Q1 score​ is separating the bottom​ 25% from the top​ 75%. Z score…

Q: Psychology students at a university completed the Dental Anxiety Scale questionnaire. Scores on the…

A: Suppose X denotes the scores and it follows a normal distribution. The normal distribution has a…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 103.1 and a standard…

A: Let "X" be the IQ scores of adults. Use excel formula "=NORM.S.INV(0.25)" to find the z-score.…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 103.6 and a standard…

A: Let X denote the IQ scores of adults. Given that X follows N(mean = 103.6, SD = 22.7), then Z = (X -…

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.