When the Standard Score = -1, what is the percentile of the raw score? %3D O 2nd 14th O 16th 34th 84th

Q: Find the percentage of data points that lie between -2.31 and 1.85.

A: Assuming the data follows standard normal distribution with mean 0 and standard Deviation 1Finding…

Q: Find the Mean number of the percents 4.38+4.62+4.88+5.02+5.33+6.30

A: Mean is the measure of central tendency. mean of the observations is sum of observations divided by…

Q: What is the probability of the ball landing on 21 playing Roulette? Make sure to round to 2 decimal…

A: Roulette has numbers 1 through 36 inclusive

Q: find 40 th percentile   10,15,18,16,19,20,24,15,26,20,22,25,28,17

A:

Q: Kari wants to do an experiment to see if class level (freshman, sophomore, etc.) affects total…

A: An experiment can be repeated multiple times and it has well-defined possible outcomes.

Q: find 37th percentile   15,28,65,45,85,35,95,65,85,42,50,60,45,85,6

A:

Q: Sally just received her SAT results. Her SAT mathematics score was 600 and is in the 74th…

A: The score is 600 and it is the 74th percentile.

Q: How do you tell percentiles in a table

A: Percentile is a score that tells the value below which a given percentage of values falls in a table…

Q: 00 subjects were studied and 120 of them expressed a preference for brand x, what percentage…

A: The 200 subjects were studied; n=200 120 of them expressed a preference for brand x; x=120

Q: What's the median of 10.2,12.6,20.4, and 13.6 to 3 decimal places

A: It is an important part of statistics. It is widely used.

Q: A poll showed that 56.1% of Americans say they believe that some psychics can help solve murder…

A: P(not A) = 1 - P(A)  When we are talking about % in probability  Than take 100% as total  So ,…

Q: so is 80% z-score 1.

A: The mean and standard deviation of standard normal distribution are 0 and 1, respectively.

Q: What is the weighted mean of the numbers 10%, 30%, 60%, 70, 86 and 94

A: The formula of weighted mean is given by…

Q: Find the percent of 16/20 and 4/20. What are the relationships between the answers?

A:

Q: Four out of five students got As in math. What percent of students got As in math?

A: From the Percentages

Q: A poll showed that 46.9% of Americans say they believe that some psychics can help solve murder…

A:

Q: Give the scores: 88, 64, 77, 94, 67, 59, 99, 87, 94, 71,75 Find the score at the 72nd percentile or…

A: Given data is88,64,77,94,67,59,99,87,94,71,75sample size(n)=11

Q: what is the annual income of a household in the 90th percentile of annual household income in…

A: In normal distribution mean, median and mode are equal Mean=Median=Mode=75847, Standard…

Q: The mean of 200 items was 50. Later on it was found that two items were wrongly taken as 92 and 8…

A:

Q: The test score at the 25th percentile is 108. What is the test score at the 75th percentile?

A: Solution

Q: 0,26,40,36,23,42,35,24,30,33 determine the value represents the 60th percentile

A: Provided data is: 20, 26, 40, 36, 23, 42, 35, 24, 30, 33. The observations P1, P2, …, P99 which…

Q: Kennedy earned scores of 92, 95, 73, 78, 94, 84, 100, 92, 85, and 75 on her reading tests. What is…

A: Answer - Given score   92, 95, 73, 78, 94, 84, 100, 92, 85, and 75                Find the mean = ?

Q: find 25th percentile   101,103,106,108,115,117,119,125,137,149

A:

Q: why do we study or use 5 averages in statistics? Elaborate

A: The 5 types of averages we use in statistics are: 1- Arithmetic mean 2-Mode 3- Median 4-Root mean…

Q: competed in an ironman race, J

A: Here it is given that - 3500 people competed in an ironman race, John finished 805th,

Q: The 20th percentile is how many inches?

A: The mean is 64 inches and the standard deviation is 2.5 inches.

Q: 85% of 0.74=

A:

Q: There were 34 females that weighed over 250 pounds. What percent of females aged 20 to 29 weighed…

A: Given data,  N~(161.61,48.95)  i.e., μ=161.61σ=48.95   If n=34 P(X>250)=?

Q: Find the 90th percentile. So 10% of the T

A: Let X be the lifetime of LCD TV sets follows an exponential distribution with a mean of 100,000…

Q: find 56th percentile   101,110,112,116,114,113,105,106,107,114,106,108,107

A: From the given information we want to find the 56 the percentile.

Q: Find P₄₁ , which is the score separating the bottom 41% from the top 59%. P₄₁ =

A: It is given that the area is 0.41.

Q: Forty percent of players scored 8 points or Sixty percent of players scored 8 points or more - less…

A: Given that,The 40th percentile for points scored per player in a game is 8.That is,P40 = 8

Q: The mean score of 7 students on a short test is 7 out of 10. If six of the seven students scored 9,…

A: The mean score of 7 students on a short test is 7 out of 10 . If six of the seven students scored…

Q: a rate compares two numbers from different categories true or false

A: A rate is a ratio that compares two different quantities that have different units of measure. A…

Q: 105,108,120,115,112,116,115,118,119,120,111,125,135,114

A:

Q: The mean of 14 numbers in a data set is 43. A new number is included in the data set. It changes the…

A:

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!