A customer service center is tracking number of complaints in each week. Let X be the number of complaints in each week. The probability distribution of X is summarized as below.  X 0 1 2 3  Probability 0.4 ? 0.15 0.05 Can we be certain that the standard deviation of X is less than 3?

Q: in a certain region, the mean annual salary for electricians is $58,650. Let x be a random variable…

A: GivenMean(μ)=58650standard deviation(s)=1890sample size(n)=40

Q: Salaries for teachers in a particular elementary school district are normally distributed with a…

A: Let X be the salaries for teachers in a particular elementary school district are normally…

Q: The average student loan debt for college graduates is $25,000. Suppose that that distribution is…

A:

Q: Suppose that the heights of men in the United States are normally distributed with a mean of 65.6…

A: The mean is 65.6 and the standard deviation is 2.7.

Q: The average student loan debt for college graduates is $25,700. Suppose that that distribution is…

A: Given that The average college student loan debt for college graduates (μ) = $25,700 The…

Q: In an certain species of newt, offspring are born either green or black. Suppose that 45% of these…

A: The mean of the sampling distribution of the sample proportion. The standard deviation of the…

Q: Since the heights of people in USA is normally distributed, what is the probability that an…

A: Given data Normal distributionP(x>μ+2σ) = ?

Q: The average student loan debt for college graduates is $25,350. Suppose that that distribution is…

A: a) The mean is 25350 and the standard deviation is 14150.

Q: a. What is the distribution of X? X - N( b Find the probability that the college graduate has…

A: Given: μ=25000σ=10900

Q: The average student loan debt for college graduates is $25,000. Suppose that that distribution is…

A:

Q: In an certain species of newt, offspring are born either green or black. Suppose that 60% of these…

A: Given Information:Sample proportion() = 60% =0.6Sample size (n) = 185

Q: What is the standard deviation of the he final exam grade distribution for all students in the…

A: Given grade (x) probability (p)  x*p x2  x2 *p 0 0.03 0 0 0 1 0.08 0.08 1 0.08 2 0.17 0.34…

Q: The average amount of students who ride the bus each year and Wilton Iowa is 60 students. The…

A: Given,   Mean = 60 Standard deviation = 5   The objective is to find the required probabilities.

Q: An amusement park ride has a bench seat designed for two passengers in each row. In this scenario,…

A:

Q: The mean annual cost for car insurance is normally distributed. For a used car, the mean annual cost…

A: Solution

Q: The final exam grade distribution for all students in the introductory statistics class at a local…

A: The formula to find the mean of the distribution is, EX=∑X·Px

Q: Manufacture of a certain component requires three different machining operations. Machining time for…

A: given data μ1 = 20 minμ2 = 30 minμ3 = 15 minσ1 = 2 minσ2 = 1  minσ3 = 1.3 minP( total time <1…

Q: In an certain species of newt, offspring are born either green or black. Suppose that 60% of these…

A: Given Information: p = 60%  Sample size (n) = 144

Q: Compute the mean number of accidents per day. b.Compute the standard deviation. c. What is the…

A: We have given that the probability distribution for the number of traffic accidents daily in a small…

Q: Suppose the weight of dogs is normally distributed with a mean of 35 pounds and a standard deviation…

A: Given,   Mean = 35 Standard deviation = 5   The objective is to find the probability a dog weighs…

Q: Let x represent the dollar amount spent on supermarket impulse buying in a 10-minute (unplanned)…

A: The provided information are: Population mean μ=32Population standard deviationσ=9

Q: A study indicates that 18- to 24- year olds spend a mean of 120 minutes watching video on their…

A: The mean is 120 minutes and the standard deviation is 20 minutes.

Q: A through C please

A: Part A: Less than 19 minutes Step 1: Determine what is askedYou are asked to find the probability…

Q: The number of homes sold by a realtor during a month has the following probability distribution:…

A: The expected value (mean) of a probability distribution is calculated by multiplying each possible…

Q: The average student loan debt for college graduates is $25,750. Suppose that that distribution is…

A: Given Average= 25750, standard deviations=14500

Q: a. Calculate the probability that the average number of minutes that diners spend at their table for…

A: Let X denote number of minutes that drivers spend at their table for dinner. Given that X follows…

Q: Solve the problem. Assume that mountain lions' weights are normally distributed with a mean of 62.6…

A: We have given that,  X be the random variable from normal distribution with mean (μ) = 62.6 ,…

Q: A manufacturer of battery claims that the life of his batteries is approximately normally…

A: Suppose the random variable x defines the battery life.

Q: Americans receive an average of 16 Christmas cards each year. Suppose the number of Christmas cards…

A: The normal distribution is the most useful theoretical distribution for continuous variables.…

Q: In a certain state, the daily amounts of industrial waste are normally distributed with a mean of…

A: Let us denote X=the daily amounts of industrial wasteGiven that X is normally distributed with…

Q: A government sample survey plans to measure the total cholesterol level of an SRS of men aged 20-34.…

A: Note: As it is not logical that “the probability that x falls within + or -2 milligrams per…

Q: A large tank of fish from a hatchery is being delivered to a lake. The hatchery claims that the mean…

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