What does standard deviation of a set of data tell you?

Standard Deviation tells you how many measurements for a group are spread out from the average (mean), or expected value Or in simple means how many standard deviations are withing the mean

hypothesising or postulating

answer: the correct answer for the fill in the blank is rods.

rods are the specialized photoreceptor cells that are present in the retina of human eye. they are responsible for vision in the night time ( also called scotopic vision). they have very low visual acuity and color distinguishing ability.

as they are responsible for vision in night time, therefore they are found predominantly in the nocturnal animals.