हिंदी

If the mean of the first n natural numbers is 20, then n = ______.

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प्रश्न

If the mean of the first n natural numbers is 20, then n = ______.

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उत्तर

If the mean of the first n natural numbers is 20, then n = 39.

Explanation:

The mean of the first n natural numbers is `(n + 1)/2`.

Thus, `(n + 1)/2 = 20`, giving n = 39.

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अध्याय 15: Statistics - FILL IN THE BLANK TYPE QUESTIONS (FBQS) [पृष्ठ १५.५५]

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आर.डी. शर्मा Mathematics [English] Class 10
अध्याय 15 Statistics
FILL IN THE BLANK TYPE QUESTIONS (FBQS) | Q 8. | पृष्ठ १५.५५
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