it is the formula for grouped data
here data arranged in proper way means with class intervals and also with cumalative feequency.Here after arranging we have to find median class by a measure of n/2(the c.f value of class exceeds this value for the first is the median class)
where L= liwer boundary of median class
c.f= cumalative frequency preceding the median class
f = frequency of median class
h= class size
hope it helps
an ammeter is likely to burn if connected in parallel because ammeter is a low resistance device and when connected in parallel, the resistance of the circuit reduces considerably. hence, a large current flows in the circuit may lead to burning of a circuit.
mate here is your answer
galvanometer g shows zero deflection. if the batteries a and b have negligible internal resistance, the value of the resistor r will be.