In a survey, 28 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $32 and standard deviation of $11. Estimate how much a typical parent would spend on their child's birthday gift (use a 95% confidence level). Give your answers to one decimal place. Provide the point estimate and margin or error. +

Q: CNNBC recently reported that the mean annual cost of auto insurance is $1019. Assume the standard…

A: Given that  Mean = 1019 Standard deviation = 238 Sample size = 72

Q: On a nationwide math test, the mean was 60 and the standard deviation was 7. If Roberto scored 90,…

A:

Q: The weight of football players is normally distributed with a mean of 200 pounds and a standard…

A: Given,mean(μ)=200standard deviation(σ)=25

Q: You want to know the percentage of medical equipment companies that earned revenue less than 62…

A:

Q: A vending machine dispenses coffee into a twelve-ounce cup. The amount of coffee dispensed into the…

A: Step 1: Determine what is askedWe need to determine the mean amount of coffee to be dispensed by the…

Q: On a nationwide math test, the mean was 63 and the standard deviation was 10. If Roberto scored 85,…

A: GivenMean(μ)=63standard deviation(σ)=10score(x)=85

Q: A data set has size of 40. How many observations lie within two standard deviations of either sides…

A: The 68-95-99.7% (Empirical) Rule: For a normal distribution, the empirical rule (68-95-99.7% Rule)…

Q: A survey of attendance records shows that high school seniors average 10.5 sick days per school year…

A: Let, x denotes sick days per school year of high school seniors. It is given that- x~N10.5,5.25

Q: Pearson revises books each semester and the mean number of pages for 2010 is 568 with a standard…

A: Let, X= number of pages  Given that X follows normal distribution with mean= 568 and standard…

Q: Omar is trying out to be a firefighter.  On the written exam, the mean of everyone who takes the…

A:

Q: On a nationwide math test, the mean was 51 and the standard deviation was 4. If Roberto scored 85,…

A: We have given the mean and standard deviation of a nationwide math test.Mean μ = 51Standard…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 105   and a standard…

A: It is given that the mean and standard deviation are 105 and 15, respectively.

Q: The measurements are 465, 589, 526, 602, 486, 542, 472, 689, and 643. Find the mean and the standard…

A: obtain the mean of the data:The mean for the given data can be obtained by entering the…

Q: unts how many meteors she se

A:

Q: A quantitative data set as a mean of 24 and a standard deviation of 2. What percent of the…

A: Given,Mean, = 24Standard deviation, S = 2Using formula (Chebyshev's theorem),Chebyshev's theorem…

Q: According to the National Association of Realtors, it took an average of three weeks to sell a home…

A: Given data: Number of randomly selected homes sold in Greene county, n = 40. Sample mean, x¯=3.6…

Q: On a standardized test, Sara had a score of 93, which was exactly 2 standard deviations above the…

A: The normal distribution in the center is generally denser and basically less dense at tails. There…

Q: Please explain. In a survey, 11 people were asked how much they spent on their child's last…

A: Given: x¯=$41s=$4n=11

Q: me the data is normally distributed. Find the 80th p ing workers. ate the result. rs make less than…

A:

Q: Find the area of the shaded region. The graph to the right depicts IQ scores of adults, and those…

A: From the provided information, Mean (µ) = 100 Standard deviation (σ) = 15 The shaded area is in the…

Q: A patient recently diagnosed with Alzheimer's disease takes a cognitive abilities test and scores a…

A:

Q: You want to know the percentage of utility companies that earned revenue less than 67 million…

A: