Q. 25.0( 5 Votes )

# The final marks in mathematics of 30 students are as follows:

53, 61, 48, 60, 78, 68, 55, 100, 67, 90, 75, 88, 77, 37, 84,

58, 60, 48, 62, 56, 44, 58, 52, 64, 98, 59, 70, 39, 50, 60

(i) Arrange these marks in the ascending order, 30 to 39 one group, 40 to 49 second group etc.

Now answer the following:

(ii) What is the highest score?

(iii) What is the lowest score?

(iv) What is the range?

(v) If 40 is the pass mark how many have failed?

(vi) How many have scored 75 or more?

(vii) Which observations between 50 and 60 have not actually appeared?

(viii) How many have scored less than 50?

Answer :

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PREVIOUSDefine the following terms :(i) Observations(ii) Raw data(iii) Fequency of an observation(iv) Frequency distribution(v) Discrete frequency distribution(vi) Grouped frequency distribution(vii) Class-interval(viii) Class-size(ix) Class limits(x) True class limitsNEXTThe weights of new born babies (in kg) in a hospital on a particular day are as follows:2.3, 2.2, 2.1, 2.7, 2.6, 3.0, 2.5, 2.9, 2.8, 3.1, 2.5, 2.8, 2.7, 2.9, 2.4(i) Rearrange the weights in descending order.(ii) Determine the highest weight.(iii) Determine the lowest weight.(iv) Determine the range.(v) How many babies were born on that day?(vi) How many babies weigh below 2.5 kg?(vii) How many babies weigh more than 2.8 kg?(viii) How many babies weigh 2.8 kg?

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