Is this sentence in active voice or passive voice?Ten to fifteen percent of adults have suffered at some point from a sleep problem called insomnia.

The sentence "Ten to fifteen percent of adults have suffered at some point from a sleep problem called insomnia" is in active voice.

In active voice sentences, the subject performs the action expressed by the verb. Here, "Ten to fifteen percent of adults" is the subject that is actively performing the action of suffering from insomnia, which is indicated by the verb "have suffered."

In contrast, passive voice would typically involve the subject receiving the action rather than performing it. For example, if the sentence were rephrased to "A sleep problem called insomnia has been suffered by ten to fifteen percent of adults," it would then be considered passive voice, as the subjects (adults) are not actively doing the suffering but rather being acted upon. Therefore, the original sentence clearly exemplifies the active voice structure.