I need help on subpart b - the standard deviation for stock x

Q: On a recent quiz, the class mean was 77 with a standard deviation of 2. Calculate the z-score (to 2…

A: Solution-: Given: μ=77,σ=2,X=78 We want to find Z-score=?

Q: Mean 255, x is 230 and z score is -2 find standard deviation

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Q: Scores on a test have a mean of 86 and a standard deviation of 13. Jerrica has a score of 94.…

A:

Q: Isn't here the standard deviation equal to 4, not 2, as the tutor wrote?

A: Solution-: Given: μ=-3,σ=4 We want to find, P(0<X<2)=? Draw the picture.

Q: suppose that you scored 60 on a test that has a population mean of 64 and a standard deviation of 8.…

A: Given: Test Score x=60 μ=64σ=8 Transform in which  μ=50σ=10

Q: Suppose the mean resting heart rate of females aged 20 is mean = 61, standard deviation = 5…

A: The objective of this question is to compare the fitness levels of a 20-year-old female and a…

Q: Suppose the lifetimes of a certain lightbulb are normally distributed with a standard deviation of…

A: From the provided information, Standard deviation (σ) = 100 Let µ be the required mean. X~N (µ, 100)…

Q: The scores on a mathematics exam have a mean of 71and a standard deviation of 8. Find the x-value…

A: Let X denote the scores on a mathematics exam and it follows normal distribution with mean of…

Q: Suppose you have a test with a mean of 66 and a standard deviation of 5. If you first increase…

A: Given Mean =66 Standard deviation=5

Q: After a researcher adds 6 points to every score in a sample, the standard deviation is found to be s…

A: The question is about change of origin.Introduction :Change of origin :If a no. is added /…

Q: Suppose that you have a X= 75 on an exam with Ú=70. Which standard deviation would give you a better…

A: Given : Suppose that you have a X= 75 on an exam with Ú=70

Q: A researcher finds that the mean income (in dollars per week) of a sample of people who live in a…

A: Given:

Q: In a population of exam scores, a score of X = 88 corresponds to z = 2 and a score of X = 79…

A: From the provided information, A score of X = 88 corresponds to z = 2 A score of X = 79 corresponds…

Q: All of the accountants at a small paper company are required to take the same accounting exam to…

A:

Q: I also need the standard deviation for the above question.

A:

Q: Suppose that pulse rates among healthy adults are normally distributed with a mean of  79…

A: Given,mean(μ)=79standard deviation(σ)=10

Q: In an exam for a statistics class, the class average is 68 with a standard deviation 4. If a student…

A: Given mean μ= 68, standard deviation σ= 4 Let X: score of the students = 75

Q: Imagine you select 30 males at random and find their mean height to be 5 ft 11 in. tall with a…

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Q: If 3 standard deviations to the left of the mean gives you a value of 30 on the normal curve and 4…

A: 3 standard deviations to the left of the mean=30i.e and 4 standard deviations to the right of the…

Q: Consider again the birth weights of newborn babies, where the mean weight is 3290 grams and the…

A: From the provided information,Mean (µ) = 3290Standard deviation (σ) = 520X~N (3290, 520)

Q: Suppose that pulse rates among healthy adults are normally distributed with a mean of 80 beats…

A: Given data  Normal distribution μ = 80σ= 10P(x≤72) = ?

Q: Suppose that replacement times for washing machines are normally distributed with a mean of 8.8…

A:

Q: (a) between 56 and 74. % (b) above 68. % (c) below 56. %

A: here as per guideline i have calculated 3 subparts , plz repost for remainning. Suppose that the…

Q: Assume that an intelligence test scores are distributed normallt with a mean of 100 and a standard…

A: Standard normal distribution: The standard normal distribution is a special case of normal…

Q: A designer collected information on the price of a random sample of newly designed products and the…

A: Note: Hey there! Thank you for the question. As you have posted a question with multiple sub-parts,…

Q: Suppose the time of renting a bicycle for a customer in a bicycle rental shop is normally…

A:

Q: When standardizing, the mean becomes 0 and the standard deviation becomes 1. True

A: The formula for standard normal score is, z=x-μσHere μ is the mean andσ is the standard deviation.

Q: If the true mean is 9590 with the standard deviation of 0.0080 within what interval will 98% of…

A: Given that , True mean = 9590 Standard Deviation = 0.0080

Q: A different investor decides to invest $8000 in Fund A and $3000 in Fund B. Assuming the amounts…

A: Here's how to proceed:### 1. Investment DetailsYou've mentioned investments of $8000 in Fund A and…

Q: There are two samples of children taken from a population. In the first sample, mean of age of 20…

A: Combined mean : To integrate two or more things into a single entity is to link them together.When…

Q: Suppose that the hemoglobin levels among healthy females are normally distributed with a mean of 14.…

A: Question: Suppose that the hemoglobin levels among healthy females are normally distributed with a…

Q: score of x=14, which value for the standard deviation would give this person the highest position in…

A: We have given that µ = 52 x = 14 z-score formula is given as  z =( x - μ )/σ

Q: uppose at the end of the year everyone at Bob’s restaurant gets a 5 percent raise per hour to their…

A: Define the Random Variable, X : Wage per hour of an  employee at Bob's restaurant at the current…

Continuous Probability Distributions

Probability distributions are of two types, which are continuous probability distributions and discrete probability distributions. A continuous probability distribution contains an infinite number of values. For example, if time is infinite: you could count from 0 to a trillion seconds, billion seconds, so on indefinitely. A discrete probability distribution consists of only a countable set of possible values.

Normal Distribution

Suppose we had to design a bathroom weighing scale, how would we decide what should be the range of the weighing machine? Would we take the highest recorded human weight in history and use that as the upper limit for our weighing scale? This may not be a great idea as the sensitivity of the scale would get reduced if the range is too large. At the same time, if we keep the upper limit too low, it may not be usable for a large percentage of the population!