Question 12 (1 point) For IEEE 754 single precision floating point numbers, how many bits for mantisa? a. 7 Ob. 31 c. 23 d. 8 Question 13 (1 point) Assume we use 8-bit cell to store floating point numbers, 1 bit for sign, 3 bits for excessed exponent, and 4 bits for significand (seeeffff). What is the excess for normalized decimals? a. 6 Ob. 7 O c. 2 O d. 3 Question 14 (1 point) For IEEE 754 single precision floating point numbers in hexadecimal, which of following is a negative denormalized floating point number? O a. 8 0 8 0 0 0 0 0 ob. OC. 8 0 0 0 0 0 0 0 Od. FF000000 e. None of the above Question 15 (1 point) For IEEE 754 single precision floating point numbers, what is the excess for normalized decimals? a. 255 b. 254 C. 127 Od. 126 e. None of the above