A student measures the time period of 100 oscillations of a simple pendulum four times. The data set is 90 s, 91 s, 95 s and 92 s. If the minimum division in the measuring clock is Is, then the reported mean time should be :

A student measures the time period of 100 oscillations of a simple pen

1.	A student measures the time period of 100 oscillations of a simple pendulum four times. The data set is 90 s, 91 s, 95 s and 92 s. If the minimum division in the measuring clock is Is, then the reported mean time should be :
Answer» `92+-3 s` `92+-2s` `92+-2s` `92+-1.8s` SOLUTION :True VALUE `=(90+91+95+92)/(4)=92` MEAN absolute ERROR `=(2+1+3+0)/(4)=(6)/(4)=1.5` Value `(92+-1.5)` SINCE `L.C=1s` `:.` Value `92+-2s`