




Card 21 / 25:
An elementary school class ran one mile with a mean of 11 minutes and a standard deviation of three minutes. Rachel, a student in the class, ran one mile in eight minutes. A junior high school class ran one mile with a mean of nine minutes and a standard deviation of two minutes. Kenji, a student in the class, ran 1 mile in 8.5 minutes. A high school class ran one mile with a mean of seven minutes and a standard deviation of four minutes. Nedda, a student in the class, ran one mile in eight minutes.
Why is Kenji considered a better runner than Nedda, even though Nedda ran faster than he?Who is the fastest runner with respect to his or her class? Explain why.

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Questions & Answers
a random variable is __________ if takes on a values continuous scale.
merits of arithmetic mean
n/sum(1/xi). this i is in subscript
moniba
this is HM formula
moniba
So guys u can help me get better in statistics
Lion
class interval and class limit are same ?
what is a differnece between class interval and class boundries ?
Shantal
interval between the element of class class interval
Hemanta
class boundary consist of the upper and lower class limits
but class class limit is the same decimal values as the data values
Najeeb
x 0 1 2 3 4 5
0.05 0.09 0.17 0.27 0.23 0.19
a) Find the probability that 1 or 2 smart phones have defects (show calculations).
b) Find the probability that more than 3 smart phones have defects (show calculations).
c) Find the probability that at most 2 smart phones have defects (show calculat
Please expand on the number set data
Jesus
A proportion is simply a statement that two ratios are equal
Foeor
Two dice are thrown. Let A be the event that the sum of the upper face number is odd and be the event of at least one ace
does proportion alwaus give u a yes or no answer for data
7.The following data give thenumber of car thefts that occurred in a city in the past 12 days.
63711438726915
Calculate therange, variance, and standard deviation.
express the confidence interval 81.4% ~8.5% in interval form
a bad contain 3 red and 5 black balls another 4 red and 7 black balls, A ball is drawn from a bag selected at random, Find the probability that A is red?
The information is given as, 30% of customers shopping at SHOPNO will switch to DAILY SHOPPING every month on the other hand 40% of customers shopping at DAILY SHOPPING will switch to other every month. What is the probability that customers will switch from A to B for next two months?
Calculate correlation coefficient, where SP(xy) = 144; SS(x) = 739; SS(y) = 58.
(2 Points)
The information are given from a randomly selected sample of age of COVID19 patients who have already survived. These information are collected from 200 persons. The summarized information are as, n= 20; ∑x = 490; s^2 = 40. Calculate 95% confident interval of mean age.
Ashfat
The mode of the density of power of signal is 3.5. Find the probability that the density of a random signal will be more than 2.5.
Ashfat
The average time needed to repair a mobile phone set is 2 hours. If a customer is in queue for half an hour, what is the probability that his set will be repaired within 1.6 hours?
Ashfat
A quality control specialist took a random sample of n = 10 pieces of gum and measured their thickness and found the mean 9 and variance 0.04. Do you think that the mean thickness of the spearmint gum it produces is 8.4
3. The following are the number of mails received in different days by different organizations:
Days (x) : 23, 35, 38, 50, 34, 60, 41, 32, 53, 67.
Number of mails (y) : 18, 40, 52, 45, 32, 55, 50, 48, 26, 25.
i) Fit a regression line of y on x and test the significance of regression.
ii) Estimate y
Source:
OpenStax, Introductory statistics. OpenStax CNX. May 06, 2016 Download for free at http://legacy.cnx.org/content/col11562/1.18
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