Question

Walk clock strict the bell once at 1 o clock 2 times at 2 o clock 3 times at 3o clock and so on . How many times will it strict in a particular day . Find the standard deviation of a number on strict the bell make a day.

Answer 1

Answer:

And. 156

Step-by-step explanation:

Do you know, in a day there are 24 hours ?

But a clock made for 12 hours . Means, we have to multiply two times to sum of stikes upto 12 hours .

so, clock strikes serially , 1 , 2 , 3, 4 , ...... 12

here what you observed?

all are in AP because common difference is always 1 .

Now, use sum of n natural number = n(n+1)/2

Here, n = 12

∴ clock strikes in 12 hours = 12(12 + 1)/2 = 78

∴ clock strikes in a day = 2 × 78 = 156

Hence answer is 156.

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