A normal distribution has a mean of 100 and a standard deviation of 10. What percent of data values are less than 90 ? O 16 % 34 % O 95 % O 32 %

Q: The proportion of men who smoke cigarettes in the US is 0.23.  A researcher took a sample of 200 men…

A: Sampling Distribution of Proportion: Standard deviation of sampling distribution of sample…

Q: For a normal distribution, given a standard deviation of 3.8 and a mean of 54, what percent lies…

A:

Q: In a Normal distribution 7% items are under 35 and 89% are under 63. Find its mean and standard…

A:

Q: WEIGHTS IN KG OF 10 PREGNANT LADIES, WERE RECORDED IN ANTENATAL CLINIC. THE MEAN WEIGHT WAS 78KG AND…

A: Given Data: Sample Mean=78 n=10 Sample Variance=45

Q: 2. For a standard normal distribution, find the percentage of data that are between 3 standard…

A: 68% area cover from mean-1standard deviation to mean+1standard deviation  95% area cover from…

Q: he mean SAT verbal score is 448, with a standard deviation of 95. Use the empirical rule to…

A:

Q: The variance of a data set is 10. What is the standard deviation of the data set? O 10 O 3.16 O 100…

A: We can find the standard deviation as below

Q: Suppose a population of individuals has a mean weight of 160 pounds, with a population standard…

A: Solution: Let X be the weight of individuals. From the given information, X follows normal…

Q: For a normal distribution with a mean of μ = 100 and a standard deviation of σ = 15, what is…

A:

Q: Suppose a normal distribution has a mean of 98 and a standard deviation of 6. What is P(x2 104)? A.…

A: We have given that.   X~N( μ , ?^2 )   μ=98   , ?=6   Z-score =( x - μ )/?

Q: Three hundred college freshmen's grade point averages are seen to be nearly regularly distributed,…

A:

Q: distribution,The average sales = 225. Standard  deviation = 40 The  upper limit for  the  middle…

A: According to the empirical rule, for normal distribution, approximately 68% of the observations fall…

Q: The systolic blood pressure for a healthy person is normally distributed with a mean of 120 and a…

A: Correct Answer is  (d) 118.95

Q: Below is the graph of a normal distribution with mean = standard deviation o = 84 and 2.4

A: Given Information: A graph of a normal distribution with mean μ = 84 and standard deviation σ=2.4 To…

Q: A distribution has mean 100 and standard deviation 3. What is the largest percent of the data that…

A: Hey there! Thank you for posting the question. Since there are multiple questions posted, we will…

Q: A sample was done, collecting the data below. Calculate the standard deviation, to one decimal…

A:

Q: For a normal distribution with a mean of μ = 10 and a standard deviation of σ = 2, what is p(5<X<15)

A: It is given that X follows N(mean = 10, SD = 2), then Z = (X - mean)/SD follows N(0,1)

Q: For a normal distribution with a mean of µ = 80 and a standard deviation of σ = 10, what is p(X<95)?…

A:

Q: The mode of a normal distribution is 65.5 and the standard deviation is 8.4. Then, what is the…

A: Given that, The value of mode is, 65.5 The value of standard deviation is, 8.4

Q: Given IQ scores are approximately normally distributed with a mean of 100 and standard deviation of…

A: We have, the population mean, μ=100                the standard deviation, σ=15 Let X=IQ score

Q: 5. Suppose a normal distribution has a mean of 60 and a standard deviation of 4. What percentage of…

A: The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ are the mean…

Q: On a standardized test with a normal distribution, the me was 64.3 and the standard deviation was…

A: We have given that  The scores follow the normal distribution with mean 64.3 and standard deviation…

Q: Given IQ scores are approximately normally distributed with a mean of 100 and standard deviation of…

A: Given IQ scores are approximately normally distributed with a mean of 100 and standard deviation of…

Q: Delta car batteries are known to be normally distributed with a mean of 45 months and a standard…

A: Given data isMean(μ)=45 monthsstandard deviation(σ)=8 months

Q: The sample standard deviation follows a normal distribution if the population follows a normal…

A: We know that- The population follows a normal distribution with mean and standard deviation, the…

Q: 18. What percentage of a normal distribution is within 2 standard deviation of the mean? A. About…

A: Hello. Since your question has multiple, we will solve first two question for you. If you want…

Q: Use the Empirical Rule and a sketch of the normal distribution in order to answer these questions.…

A: Empirical rule (68 – 95 – 99.7 rule): For a bell shaped distribution (normal) the empirical rule…

Q: Given IQ scores are approximately normally distributed with a mean of 100 and  standard deviation of…

A: GivenMean(μ)=100standard deviation(σ)=15

Q: The commute time for Cypress College students who drive from their home to the college follows a…

A:

Q: Which statement about standard error is false? O A. It is a measure of the variability of a…

A: We need to find, which statement about standard error is false:- A. It is a measure of the…

Q: A commonly used test of intelligence (IQ) results in a normal distribution with a mean of 100 and a…

A: Given information Mean µ = 100 Standard deviation σ = 15

Q: The proportion of observation from a standard normal distribution that take values less than 1.5 is…

A: P(Z&lt;1.5)=?   By using standard normal table the probability for 1.5 is  0.9332.   P(Z&lt;1.5)=…

Q: Consider the normal distribution of IQs with a mean of 100 and a standard deviation of 16. What…

A:

Q: If X has a normal distribution with mean 78 and standard deviation 7, which value of X corresponds…

A: Given information: The mean and standard deviation of scores are 78 and 7, respectively.

Q: Find the 99th percentile of a normal distribution with mean 5 and variance 1. 1.28 .99 O 1.645 7.33

A: Given that mu =5,s.d =1,p value =0.99

Q: Suppose X has a normal distribution with mean 80 and standard deviation 5. What is the 90th…

A: Given that, Mean = 80 Standard deviation = 5

Q: For a normal distribution with a population of  μ = 54 and a standard deviation of σ = 12, find the…

A:

Q: The price-earnings (PE) ratios of a sample of stocks have a mean value of 12.75 and a standard…

A:

Q: A random sample of 30 students had a final exam average of 86 with a standard deviation of 2 points.…

A: Probability distributions are of two types, discrete and continuous distributions. Normal…

Q: The time that a customer takes to complete a transaction in the business line at the bank follows a…

A: Given Data Population Mean,μ = 5.4 Population Standard Deviation,σ = 1.7

Q: A distribution has mean 100 and standard deviation 3. What is the largest percent of the data that…

A: Given: Formula:

Q: If the Statistics grades of 10000 students follows a normal distribution with mean 75. and the…

A:

Q: A uniform distribution has endpoints 4 and 18. A. What is the mean? B. What is the standard…

A: As per our guidelines we can solve first three subpart and rest can be reposted. Solution-: Let, X-…

Q: A data set has a normal distribution with a mean of 100 and a standard deviation of 10. VWhat…

A: We have to find correct answer for given question...

Q: If a normal distribution has a mean of 60 and a standard deviation of 5, complete the normal…

A:

Q: Suppose a normal distribution has a mean of 79 and a standard deviation of 7. What is P(xs 65)? O A.…

A: Normal distribution has mean =79 and SD = 7, p(X&lt;=65) = ?

Q: The graph of a normal curve is given below. -7-4 -1 2 8. 8 11 X The value of the mean () is and the…

A: As the given graph is stated to be normal, and we know in the normal distribution,…

Q: In a certain population, let us assume that high school scores are normally distributed with mean of…

A: Obtain the 75th percentile.   The value of 75th percentile is obtained below as follows:

Q: What is the value of the Pearson coefficient of skewness for a distribution with a mean of 27,…

A:

Q: A population data set with a normal distribution has a mean µ = 4 and a standard deviation o = 1.1.…

A: According to the given information, we have Mean = 4 Standard deviation = 1.1

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.