Which type of household do you think comprises the largest portion of all poor households in the united states? in other words, the most numerous type of poor household is households headed by?

hygrometers and hair thermometers (often found as part of hygrometers/psychrometers) can be used to measure humidity. barometers are used to measure atmospheric pressure, while anemometers are used to measure wind speed. so the 2nd and 4th choices should be the correct answers.