in normal distribution 31% iteams are under 45 and 8% are over 64 .find mean and verience
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ɨ ɮɛʟɨɛʋɛ ȶɦɨֆ ɨֆ ǟ ɦօʍɛաօʀӄ զʊɛֆȶɨօռ. ֆօ ɨ աօռ'ȶ ɢɨʋɛ ʏօʊ ȶɦɛ ɛӼǟƈȶ ֆօʟʊȶɨօռ.
ȶɦɨֆ ɨֆ ǟ ƈʟǟֆֆɨƈ ɛӼǟʍքʟɛ օʄ ʄɨռɖɨռɢ ʍɛǟռ ǟռɖ ֆȶǟռɖǟʀɖ ɖɛʋɨǟȶɨօռ ʊֆɨռɢ ʐ ʋǟʟʊɛֆ.
ʄʀօʍ ȶɦɨֆ քǟɢɛ ʄɨռɖ ȶɦɛ ʐ ʋǟʟʊɛ ƈօʀʀɛֆքօռɖɨռɢ ȶօ 31% ǟʀɛǟ ʊռɖɛʀ ȶɦɛ ƈʊʀʋɛ ǟռɖ 92% (100-8) քɛʀƈɛռȶ ǟʀɛǟ ʊռɖɛʀ ȶɦɛ ƈʊʀʋɛ.
ʍǟȶɦ ɨֆ ʄʊռ ʋɨʀȶʊǟʟ ʍǟռɨքʊʟǟȶɨʋɛ
ռօȶɛ: ʏօʊ'ʟʟ քʀօɮǟɮʟʏ ɮɛ ɢɨʋɛռ ȶǟɮʟɛֆ ȶօ ʟօօӄʊք ɨռ ʏօʊʀ զʊɨʐʐɛֆ.. ȶɦɛʏ'ʀɛ ǟ ɮɨȶ ƈօռʄʊֆɨռɢ. ɮʊȶ ʏօʊ ʍɨɢɦȶ ǟֆ աɛʟʟ ʟɛǟʀռ ɦօա ȶօ ʊֆɛ ɨȶ.
ǟֆ ʏօʊ ӄռօա:
ʐ=Ӽ−μσʐ=Ӽ−μσ
քʊȶ ɨռ Ӽ ǟռɖ ʐ ʋǟʟʊɛֆ ʋǟʟʊɛֆ ȶաɨƈɛ, ʏօʊ'ʟʟ ɦǟʋɛ ȶաօ ʟɨռɛǟʀ ɛզʊǟȶɨօռֆ.
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plєαsє mαrk thє uppєr αnswєr αs вrαínlєíst
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