13) The table below describes the smoking habits of a group of asthma sufferers. Light Heavy
Nonsmoker smoker smoker Total
Men 352 39 37 428
Women 321 42 45 408
Total 673 81 82 836
If two different people are randomly selected from the 836 subjects, find the probability that they are both heavy
smokers. Round to six decimal places.

step-by-step explanation:

what grade level is this? need to know so i can look in my old textbooks!

explanation:

infrared radiation has wavelength in the range between 700 nm and 1 mm. lets' convert these values into scientific notation, keeping in mind that:

let's start from the lower value, we have:

(we moved the dot two places to the left, so we increased the exponent by 2 units, from -9 to -7)

the higher value is:

so, the range of wavelength of infrared radiation is: