1 A fair die is thrown 10 times. Find the probability that the number of sixes obtained is between 3 and 5 inclusive.
2120 people were asked to read an article in a newspaper. The times taken, to the nearest second, by the people to read the article are summarised in the following table.
Time (seconds)
\(1 - 25\)
\(26 - 35\)
\(36 - 45\)
\(46 - 55\)
\(56 - 90\)
Number of people
4
24
38
34
20
Calculate estimates of the mean and standard deviation of the reading times.