The physical plant at the main campus of a large state university recieves daily requests to replace florecent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a mean of 42 and a standard deviation of 4. Using the empirical rule (as presented in the book), what is the approximate percentage of lightbulb replacement requests numbering between 42 and 54? Do not enter the percent symbol. ans- %

Q: A bank's loan officer rates applicants for credit. The ratings are normally distributed with a mean…

A:

Q: for this set of data, the standard deviation is equal to: 9,8,10,5,5,2,3,6,3

A: Mean:The formula for finding mean is shown below:

Q: The average age of our class is 22.3 years.  The standard deviation is 4.7 years.  If the variable…

A: Solution: Let X be the average age of class has normal  distribution  with mean μ=22.3 years and…

Q: Carol-Anne is an environmental scientist studying the heights of red oak trees in a nearby marsh and…

A: It is given that the researcher randomly selected 10 red oak trees from each habitat and records the…

Q: According to data for a​ population, 3-year-old boys have a mean height of 38 inches and a standard…

A: given data normal distributionμ = 38 inchesσ = 2 inchesfor x = 42 inchespercentile = ?

Q: In a statistical test, we have a choice of a left-tailed test, a right-tailed test, or a two-tailed…

A: We know that ; Type of test will be depending upon Alternative hypothesis. A one tailed test has the…

Q: a bank's loan officer rates applicants for credit. the ratings are normally distributed with a mean…

A: We have to find 60th percentile.

Q: minutes. What percentage of his commutes will be between 13 and 26 minutes, to the nearest tenth?

A: Let X be the random variable that amount of time to arrive. Given that, X~N(μ=23,σ=5)

Q: The height of trees in a nursery is normally distributed with a mean of 56.4 inches and a standard…

A: The height of trees in a nursery is normally distributed with a mean of 56.4 inches and a standard…

Q: A successful basketball player has a height of 6 feet 8 ​inches, or 203 cm. Based on statistics from…

A: Consider X is a random variable defined as the height of a successful basketball player.The provided…

Q: The mean annual income for people in a certain city (in thousands of dollars) is 42, with a standard…

A: The formula for mean of the Z-score is, Z=x¯-μσn Here n is the sample size, μ is the population mean…

Q: The prices of all college textbooks follow a bell-shaped distribution with a mean of $180 and…

A:

Q: The mean gas mileage for a hybrid car is 57 miles per gallon. Suppose that the gasoline mileage is…

A:

Q: Heights for 16-year-old boys are normally distributed with a mean of 68.3 in. and a standard…

A: Given information: μ=68.3, σ=2.9 The P-value for the 96th percentile = 0.96 Determine the z-score…

Q: The relative frequency histogram represents the length of phone calls on​ George's cell phone during…

A: A histogram is a visual representation of continuous data.

Q: Assume that women have heights that are normally distributed with a mean of 63.6 inches and a…

A:

Q: The cruising altitudes for the fleet of one commercial airliner are normally distributed with a mean…

A: It is given that the mean is 34,950 and the standard deviation is 1,800.

Q: A particular fruit's weights are normally distributed, with a mean of 230 grams and a standard…

A: The provided information is:

Q: A standardized test has a pop. mean of 152 and a standard deviation of 16. Molly scores at the 91st…

A:

Q: Consider the variable, type of birth control practiced (e.g., an IUD, condoms, none, etc). Which…

A:

Q: Write the steps of calculating the population standard deviation.

A: Standard deviation: The standard deviation is based on how much each observation deviates from a…

Q: Lightbulbs are measured in lumens (light output), watts (energy use), and hours (life). A standard…

A: Given:-            Standard white light bulb mean = 675 hours…

Q: percent of men meeting these height requirements.

A: Assume that the heights of American men are normally distributed with a mean of 69.0 inches and a…

Q: the Empirical Rule. The mean speed of a sample of vehicles along a stretch of highway is 70 miles…

A:

Q: A particular fruit's weights are normally distributed, with a mean of 464 grams and a standard…

A: Let "x" be the weight of the fruit in grams. Sketch the normal curve and shade the area of 0.18…

Q: The mean gas mileage for cars driven by the students at Chillville High Schoo is 28.0 miles per…

A: Normal distribution is continuous distribution which has many real life applications. Standard…

Q: The mean height of males 20 years old or older is 69.1 inches with a standard deviation of 2.8…

A: given data x = height of 20 years old or older μ = 69.1  inchesσ = 2.8 incheskevin's height,x = 83…

Q: Use the Empirical Rule. The mean speed of a sample of vehicles along a stretch of highway is 67…

A: Empirical rule is used in statistics and probability.

Q: A particular fruit’s weights are normally distributed, with a mean of 712 grams and a standard…

A: Given,mean(μ)=712  gramsstandard deviation(σ)=28  grams

Q: A baseball team is reviewing their batting statistics. The mean number of hits for the batters on…

A: Given Population mean μ=124,  standard deviations σ=14.5  Let X be the baseball team is reviewing…

Q: A particular fruit's weights are normally distributed, with a mean of 620 grams and a standard…

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

Q: A hiring manager rates a large pool of job applicants for eligibility for a job vacancy. The ratings…

A: Determine the value of rating score that separates the top 10% with the rest.   The value of…

Q: Identify the data value corresponding to the indicated percentile. The amount of sleep an adult gets…

A: The normal distribution:A continuous random variable X is said to follow normal distribution with…

Q: Find the standard deviation of the following values: 2.58x10-5, 2.33x10-5, 3.28x10-5, 3.57x10-5

A:

Q: The mean temperature in Amman for the month of October is 23 degrees with a standard deviation of…

A:

Q: Use the Empirical Rule. The mean speed of a sample of vehicles along a stretch of highway is 63…

A: Solution: Let X be the speed of a vehicle along a stretch of highway. From the given information, X…

Q: The heights of men aged 20 to 29 are normally distributed with a mean of 69.2 inches and a standard…

A: we have given that, the heights of men aged 20 to 20 are normally distributed with mean (mu) =69.2…