Midterm StatsBegging for PointsOverall PerformanceStatisticsGrading Cutoff’sBias/Excess NotationSlide 7Question #6(b)Question #6(c)Code TraceNegabinaryNegabinary (con’t)Questions?Slide 141Midterm Stats Midterm Stats If you really must knowIf you really must know2Begging for PointsBegging for Points•DO approach if we’ve made a mistake DO approach if we’ve made a mistake adding up points on your test.adding up points on your test.•DO approach is we’ve marked something DO approach is we’ve marked something wrong that was actually rightwrong that was actually right•DO NOT approach if you don’t like the DO NOT approach if you don’t like the amount of partial credit you got.amount of partial credit you got.•DO NOT approach if you don’t like your DO NOT approach if you don’t like your grade.grade.3Overall PerformanceOverall Performance4StatisticsStatistics•High: 100.5, Low: 41.5High: 100.5, Low: 41.5•Mean: 73.11Mean: 73.11•Median: 72.5Median: 72.5•Standard Deviation: 14.71Standard Deviation: 14.71•Grade DistributionGrade Distribution–7 A’s (A-, A, A+)–14 B’s (B-, B, B+)–10 C’s (C-, C, C+)–4 below C5Grading Cutoff’sGrading Cutoff’s•≥≥ 100 100 A+ A+•≥≥ 90 90 A A•≥≥ 86 86 A- A-•≥≥ 82 82 B+ B+•≥≥ 78 78 B B•≥≥ 71 71 B- B-•≥≥ 68 68 C+ C+•≥≥ 63 63 C C•≥≥ 60 60 C- C-•≥≥ 55 55 D+ D+•≥≥ 50 50 D D•Below 50 Below 50 F F6Bias/Excess NotationBias/Excess NotationHEX Signed Magnitude 1's Complement 2's Complement Excess 1270x950001 11011100 1001 1010 1110 1100 01007•(6 points) (6 points) Data RangesData Ranges. Given . Given 7-bits7-bits to work with, what number ranges to work with, what number ranges could you represent in the following could you represent in the following formats:formats:–Unsigned ____________________________–Sign Magnitude ______________________–One’s Complement ______________________–Two’s Complement______________________–Bias ______ Notation ________________ (bias for max +/– range)8Question #6(b)Question #6(b)–(4 points) 8-bit, Excess 128 numbers•0x73 + 0x55•0xB4 – 0xDE9Question #6(c)Question #6(c)•0x72 × 0xFB10Code TraceCode Trace.orig xA400bob and R4, R4, #0bill add R4, R4, #-2jill lea R0, jilljane ld R1, janebeef ldi R2, cafebabe ldr R3, R0, #3 haltcafe .fill xA405.endRegister Value (in HEX)R0R1R2R3R411NegabinaryNegabinary•1110110111101101-2-2 = ? = ?101012Negabinary (con’t)Negabinary (con’t)•39391010 = ? =
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