document.write( "Question 1168786: In one month, a student recorded the lengths, to the nearest minute,
\n" ); document.write( "of each of the lectures she attended. The table below shows her data
\n" ); document.write( "and the calculations she made before drawing a histogram to illustrate
\n" ); document.write( "these data.
\n" ); document.write( "Calculate
\n" ); document.write( "Length of lecture (minutes) 50 ≤ x < 53 53 ≤ x < 55 55 ≤ x < 59 59 ≤ x < 67
\n" ); document.write( "Number of lectures a b 30 c
\n" ); document.write( "Frequency density 5 13 7.5 1.5
\n" ); document.write( "(i) The value of a, of b and of c.
\n" ); document.write( "(ii) The number of lectures attended in a month.
\n" ); document.write( "(iii) Using the assumed mean of A = 57.4, calculate the mean length
\n" ); document.write( "of lectures.
\n" ); document.write( "(iv) Calculate the Median and the Variance of the distribution. \n" ); document.write( "
Algebra.Com's Answer #793459 by ikleyn(52787)\"\" \"About 
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