Heights (in cm) of 30 girls of Class IX are given below:
140, 140, 160, 139, 153, 153, 146, 150, 148, 150, 152,
146, 154, 150, 160, 148, 150, 148, 140, 148, 153, 138,
152, 150, 148, 138, 152, 140, 146, 148.
Prepare a frequency distribution table for this data.
As the number of tosses of a coin increases, the ratio of the number of heads to the total number of tosses will be 1/2 . Is it correct? If not, write the correct one.
Can the experimental probability of an event be greater than 1? Justify your anwer.
Can the experimental probability of an event be a negative number? If not, why?
The class marks of a continuous distribution are :
1.04, 1.14, 1.24, 1.34, 1.44, 1.54 and 1.64
Is it correct to say that the last interval will be 1.55 – 1.73? Justify your answer
Is it correct to say that in a histogram, the area of each rectangle is proportional to the class size of the corresponding class interval? If not, correct the statement.
A child says that the median of 3, 14, 18, 20, 5 is 18. What doesn’t the child understand about finding the median?
In a diagnostic test in mathematics given to students, the following marks (out of 100) are recorded :
46, 52, 48, 11, 41, 62, 54, 53, 96, 40, 98, 44
Which ‘average’ will be a good representative of the above data and why?
Consider the data : 2, 3, 9, 16, 9, 3, 9. Since 16 is the highest value in the observations, is it correct to say that it is the mode of the data? Give reason.
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