Following IEEE standard exponent all 7 bit 1 that is 127 is reserved for special purpose
Thus max possible +ve value is +1.11111111*$2^{126-63}$
Min Possible -ve Number is -1.11111111*$2^{126-63}$
Min possible +ve value is (demoralized form) +0.00000001*$2^{-62}$
MAX possible -ve value is -0.00000001*$2^{-62}$