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Kindly reply with correct answers and step by step working.mention clearly about the formula and conversion.do not skip steps.

Q1

The following data represents the time taken (in minutes) by a group of students to complete an experiment in laboratory. Time taken (in minutes) Number of students 1 - 20 U N 21 - 40 41 - 60 8 61 - 80 25 81 - 100 15 a ) Construct a histogram for the above data. (3 marks) b) From the histogram, find the value of X if most of the students completed an experiment in X minutes. (2 marks) c) Calculate the mean and standard deviation for the above data