According to National Center for Health Statistics, in 2018, the average age of first-time mothers was 26, with a standard deviation of 2.5 years. If a woman had her first child at 30 years old, what percentile would she be in? (Hint: Use Z-scores and Standard Normal Table.) Show work!

Q: Yoonie is a personnel manager in a large corporation. Each month she must review the employees in…

A: Solution: It is given that from the past experience of Yoonie, it takes her approximately four hours…

Q: The mean of a set of data is 108.06 and its standard deviation is 115.45 What is the z score for a…

A: Z-score = 3.3045 answer.

Q: An IQ exam has a mean of 110 and a standard deviation of 12. What percent of people have an IQ score…

A: Given mean= 110 Standard deviation=12 We know that Z=X-mean/standard deviation

Q: A group of 625 high school students has a mean age of 15.8 years with a standard deviation of 1.2…

A:

Q: if a student scored 88 points on a test when the mean score was 80.2 and the standard deviation was…

A: From the provided information, Mean (µ) = 80.2 Standard deviation (σ) = 5.7

Q: An IQ test has a mean of 97 and standard deviation of 10. Which is more unusual, an IQ of 87 or an…

A: Given data  μ = 97σ = 10which score is more unusual? 87 or 110?

Q: The results of a common standardized test used in psychology research is designed so that the…

A: Suppose that the random variable x defines the scores in psychology research.

Q: According to a company’s website, the top 33% of the candidates who take the entrance test will be…

A: It is given that the mean is 74 and standard deviation is 6.

Q: The results of a common standardized test used in psychology research is designed so that the…

A: Consider X be a random variable which follows normal distribution indicating the score earned on a…

Q: Suppose the exam average in a class is 48% with a standard deviation of 15. What proportion of…

A:

Q: Suppose that IQ scores have a bell-shaped distribution with a mean of 97 and a standard deviation of…

A:

Q: The mean number of hours per day spent watching television, according to a national survey, is 3.5…

A: From the provided information, Mean (µ) = 3.5 Standard deviation (σ) = 2

Q: Erika scored at the 45th percentile on the Stanford Achievement Test (mean= 500, standard deviation…

A:

Q: Jason's z- score in the 10-k run was -3. if the raw score standard deviation was 5, and the mean…

A:

Q: The local police force gives all applicants an entrance exam and accepts only those applicants who…

A: The score that corresponds to the top 15% is, The Z-score that corresponds to the area 0.85 is…

Q: If the mean score on a math quiz is 12.6 and 38.2​% of the students in your class scored between…

A: Mean = 12.6 area between 11.1 and 14.1 is 38.2%

Q: The mean age of clients at a local nail salon is 33.9 years. If 7.21% of the clients are older than…

A:

Q: A person in the U.S. eats about 25 pounds of M&M's per year with a standard deviation of 3 pounds.…

A: Solution: Given  μ= 25 Pounds  Population meanσ= 3 Pounds Population standard deviations Assumed…

Q: The distribution of the amount of money spent by first-time gamblers at a major casino in Las Vegas…

A: The amount of money spent by firs-time gamblers at a major casino in Las Vegas is Normal with  .

Q: About how many people got a score below 23?

A: Let X denotes the score of the test. Given that X follows N(mean = 28, SD = 6), then Z = (X -…

Q: A person’s IQ must be in the upper 2% of the population to be considered into the Honor Society.  If…

A: Given Information: A person’s IQ must be in the upper 2% of the population to be considered into the…

Q: A successful basketball player has a height of 6 feet 11 ​inches, or 211 cm. Based on statistics…

A:

Q: there are 75 students in the class and 20 students are getting a+ grade in the class find the mean…

A:

Q: e distribution of the amount of money spent by first-time gamblers at a major casino in Las Vegas is…

A: Given that  The distribution is normal. Mean (μ)= $600 Standard deviation (σ) = $120   We know that…

Q: When you have significant results in data analysis, it is customary to report all relevant means and…

A: Data Analysics is a process of inspecting, cleansing, transforming, and modeling data with the goal…