Such heart rate at rest indicates cardiac efficiency of an individual, and ranges between 60 to 100 bpm (beats per minute) for adults. However, values closer to the lower limit of this range qualify as a good resting heart rate. In fact, well trained athletes show a resting heart rate between 40 to 60 bpm.
Rule 1. With a computer, use only one space following periods, commas, semicolons, colons, exclamation points, question marks, and quotation marks. The space needed after these punctuation marks is proportioned automatically.
I was taught it was two. A good way to remember this is by counting the dots on it. The colon has two so it has two spaces. A semi colon has only one dot, and it has only one space after it. But this only applies when the name of the punctuation has the word colon in it, as when you are counting the dots in a period, you only see one, but after a period, you usually put two spaces unless you are using a wesite address or something of that sort.