206, 254, 240, 203, 191, 208, 218, 235, 242, 237, 213, 222, 228, 201, 225, 186 whats the 25th percentile

Q1 or the 25th percentile is 204.5

Step-by-step explanation:

Combine all data values in TI-84, excel, or other software and make a box and whisker plot. The Q1 is the first vertical line on the plot

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: