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The mean of 20 observations was 85 but l...

The mean of 20 observations was 85 but later it was found that 97 was misread as 79. The correct mean is :
20 अवलोकनों का माध्य 85 था, परंतु बाद में यह पाया गया कि 97 को गलती से 79 पढ़ लिया गया था | सही माध्य है :

A

85.8

B

85.7

C

85.6

D

85.9

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