Playing the old percentage game

SIR – Many thanks for publishing my Letter To The Editor in last month’s edition of Security Management Today (‘Search for an answer no longer!’, pp16-19).

I would like to point out to readers that paragraph eight of the original should read: “After all, from Table 1 there is only a 0.03% chance of all five being caught. That’s a better than 99.9% chance of one or more carriers gaining entry.”

If anyone would like to contact me to discuss the contents of my original correspondence they can reach me on e-mail at: bob.anderson@bifm.org.uk