frequency distribution

The scores of 60 students of a class are shown in the frequency distribution. Scores Frequency 86 - 96 14 97 - 107 7 108 - 118 13 119 - 129 10 130 - 140 11 141 - 151 5 Find the mean and the modal class of the data. => 115 and 151 or 115.2 and 86 - 96 or 115.3 and 141 -..

The quiz scores of 50 students of a class is as shown in the frequency distribution. Quiz score Frequency 0 - 2 6 3 - 5 13 6 - 8 9 9 - 11 14 12 - 14 8 Find the variance and standard deviation. => 7.3 and 68.14 or 3.89 and 1.97 or 3.89 and 15.15 or 15.15 and 3.89..

A frequency distribution of the duration of telephone calls monitored at the local telephone exchange are shown. Length of calls(minutes) Number of calls 2.5 - 4.5 10 4.5 - 6.5 15 6.5 - 8.5 30 8.5 - 10.5 15 Construct a frequency polygon and ogive for the data. => Graph..

Mr. Craig made a frequency distribution for the scores secured by his students in a test. Score Number of students Below 75 9 76 - 80 19 81 - 85 3 86 - 90 5 91 - 95 3 96 - 100 1 How many students got more than 85 points? => 12 or 19 or 9 or 5..

A paediatric hospital presents data on the number of children and their stay in the hospital for their postnatal care during March 2005 as a frequency distribution: Days Number of children 0 - 4 25 5 - 9 11 10 - 14 10 15 - up 4 What is the probability that a child selected at ra..

A field survey shows the lifetime (in years) of a particular model of a washing machine in the frequency distribution table. Lifetime of washing machines Number of washing machines 0 - 2 5 2 - 4 16 4 - 6 13 6 - 8 7 8 - 10 5 10 - 12 4 Find the variance and standard deviation. => ..

The frequency distribution shown here illustrates the number of goals scored by country X in the last 30 matches. Number of goals scored Number of matches 0 12 1 8 2 2 3 3 4 or more 5 If a match is selected at random, then what is the probability that the number of goals scored ..

The weight (in grams) of a sample of 50 eggs are as shown in the frequency distribution table. Weight Frequency 80 - 84 2 85 - 89 6 90 - 94 12 95 - 99 14 100 - 104 10 105 - 109 5 110 - 114 1 Find the variance and standard deviation. => 6.85 and 2.62 or 96.3 and 9319.7 ..

Sixty eight randomly selected refrigerators were tested to determine their life span (in years). The relevant frequency distribution is as shown. Lifetime of refrigerators Frequency 10.5 - 14.5 6 14.5 - 18.5 12 18.5 - 22.5 25 22.5 - 26.5 17 26.5 - 30.5 8 Find the varia..

The frequency distribution represents the data obtained from a sample of computer repairs. The values are the mean time (in hours) between repairs on 80 machines. Mean time between repairs Number of machines 25.5 - 28.5 5 28.5 - 31.5 9 31.5 - 34.5 32 34.5 - 37.5 20 37.5 - 40.5 1..