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\( \qquad \) 36. เด็ก 7 คน มีอายุดังนี้ \( 8,12,10,12,9,7,5 \) อีก 3 ปี ข้างหน้า จงหาค่าเฉลี่ยอายุของเด็กทั้ง 7 คน

Ask by Sullivan Mitchell. in Thailand
Mar 09,2025

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ในอีก 3 ปีข้างหน้า ค่าเฉลี่ยอายุของเด็ก 7 คนจะเป็น 12 ปี.

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อีก 3 ปี ข้างหน้า ทุกคนจะเพิ่มอายุขึ้น 3 ปี ดังนั้นอายุเด็กแต่ละคนจะเป็น \(8+3, 12+3, 10+3, 12+3, 9+3, 7+3, 5+3\) หรือ 11, 15, 13, 15, 12, 10 และ 8 ปี ตามลำดับ ในการหาค่าเฉลี่ยให้นำอายุทั้งหมดมาบวกกันแล้วหารด้วยจำนวนเด็ก: \[ (11 + 15 + 13 + 15 + 12 + 10 + 8) = 94 \] จากนั้นหารด้วย 7: \[ \frac{94}{7} \approx 13.43 \] ดังนั้น ค่าเฉลี่ยอายุของเด็กทั้ง 7 คนอีก 3 ปีข้างหน้า จะเท่ากับประมาณ 13.43 ปีค่ะ

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Question 12(Mulliple Choice Warth 5 points) \[ (04.06 \mathrm{HC}) \] A researcher wants to test the claim that the proportion of juniors who watch television regularly is greater than the proportion of seniors who watch television regularly She finds that 56 of 70 randomly selected juniors and 47 of 85 randomly selected seniors report watching television regularly. Construct \( 95 \% \) confidence intervals for each population proportion. Which of the statemente gives the correct outcome of the research or's tert of the dalim? The \( 95 \% \) confidence interval for juniors is (706, 894), and the \( 95 \% \) confidence interval for seniors is ( 447,659 ). Since the intervals overlap, there is not enough evidence to say the proportion of juniors who watch television regularly may be higher than that of seniors. The \( 95 \% \) confidence interval for juniors is (721, 879), and the \( 95 \% \) confidence interval for seniors is (464, 642). Since the interval for juniors is higher than the interval for seniors, there is evidence to say the proportion of juniors who watch television regularly may be higher than that of seniors. The \( 95 \% \) confidence interval for juniors is ( 706,894 ), and the \( 95 \% \) confidence interval for seniors is ( 447,659 ). Since the interval for juniors is higher than the interval for seniors, there is evidence to say the proportion of juniors who watch television regularly may be higher than that of seniors. The \( 95 \% \) confidence interval for juniors is ( \( 721, .879 \) ), and the \( 95 \% \) confidence interval for seniors is (464, 642). Since the intervals overlap, there is not enough evidence to say the proportion of juniors who watch television regularly may be higher than that of seniors.

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