QUICK TEST - DISTRIBUTION

QUESTION 1:

Mrs Bronte made a dot plot to show the marks obtained by her Year 10 students on an English essay. The essay was marked out of 20.


(a) How many students scored full marks?

(b) What was the lowest mark?

(c) What mark was scored by exactly 5 students?

(d) How many students scored 80%? 

(e) How many students are in the class? 

(f) What fraction of the students scored 18 or more?

(g) Which score(s), if any, are outliers?




QUESTION 2:  





QUESTION 3: 



QUESTION 4: 


Comments

Post a Comment

Bình luận của bạn sẽ được duyệt trước khi đăng.

Popular posts from this blog

MEASURES OF CENTRE AND SPREAD

Image
  The median, range and interquartile range The most versatile statistical tools for numerically describing the centr e and spread of a  distribution are:  the median (the middle value) as a measure of centre ;  the range (the maximum spread of the data values), and the interquartile range (the  spread of the middle half of data values) as measures of spread . While these statistical values ( median, range, interquartile range ) could be estimated only approximately from a histogram , they can be determined exactly when we use either a dot or a  stem plot .                                           MEDIAN Activity 1:  Finding the median value in a data set. Order each of the following data sets, locate the median, and record its value. (a)   2 9 1 8 3 5 3 8 1  For an odd number of data values, the median will be the middle data valu...
Read more

DATA ANALYSIS: INTERPRETATION

Image
 QUESTION 1:  QUESTION 2:  QUESTION 3:  QUESTION 4:  QUESTION 5:  QUESTION 6:  QUESTION 7:  QUESTION 8:  QUESTION 9:  QUESTION 10:  QUESTION 11:  QUESTION 12:  QUESTION 13:  QUESTION 14:  QUESTION 15: QUESTION 16: QUESTION 17: QUESTION 18: QUESTION 19: QUESTION 20: QUESTION 21: QUESTION 22: QUESTION 23: QUESTION 24: QUESTION 25: QUESTION 26: QUESTION 27: QUESTION 28: QUESTION 29: QUESTION 30: QUESTION 31: QUESTION 32: QUESTION 33: QUESTION 34: QUESTION 35: QUESTION 36: QUESTION 37: QUESTION 38: QUESTION 39: QUESTION 40: QUESTION 41: QUESTION 42: QUESTION 43: QUESTION 44: QUESTION 45: QUESTION 46: QUESTION 47: QUESTION 49: QUESTION 50: QUESTION 51: QUESTION 52: QUESTION 53: QUESTION 54: QUESTION 55: QUESTION 56: QUESTION 57: QUESTION 58: QUESTION 59: QUESTION 60:
Read more

THE MEAN and STANDARD DEVIATION

Image
 In this section, we will look at alternative measures of centre (the mean) and spread (the standard deviation) that are only useful when working with symmetric distributions without outliers. While this may seem unnecessarily restrictive, these two measures have the advantage of being able to fully describe the centre and spread of a symmetric distribution with only two numbers. 1. The mean. The mean is the balance point of a distribution.  A general characteristic of symmetric distributions is that the mean and the median coincide. Example 1:    The balance point of the distribution is also the point that splits the distribution in half. That is, there are two data points to the left of the mean and two to the right.  The relationship between the mean and the median Whereas the median lies at the midpoint of a distribution , the mean is the balance point of the distribution . For approximately symmetric distributions, both the median and mean will be approxima...
Read more