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A couple gave birth to their son a year after their marriage , the sum of the ages of that couple was equal to the current age of lady. When their son was born, the mother age was 2 less than the current age of the son. The ratio of the current ages of mother and father is 25/27 . The current age of son is :

What volume of hydrogen and oxygen would be obtained at 27^@C and 740 mm of Hg by passing a current of 25 amperes through acidulated water for 24 hours?

Electrolysis of a solution of MnSO_(4) in aqueous sulphuric acid is a method for the preparation of MnO_(2) . Passig a curret of 27 A for 24 hours gives 1 kg of MnO_(2) . The current efficiency in this process is:

A 3*0cm wire carrying a current of 10A is placed inside a solenoid perpendicular to its axis. The magnetic field inside the solenoid is given to be 0*27T . What is the magnetic force on the wire?

The following table gives the number of finished articles turned out per day be different number of workers in a factors. Find the standard deviation of the daily output of finished articles. Find the variance and standard deviation of the following frequency distribution: Number of article:, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27 No. of workers:, 3, 7, 11, 14, 18, 17, 13, 8, 5, 4