Three Months Ended
% Variation
December 31, 2019
September 29, 2019
December 31, 2018
Sequential
Year-Over-Year
(Unaudited, in millions)
Automotive and Discrete Group (ADG)
$924
$894
$967
3.3%
(4.5)%
Analog, MEMS and Sensors Group (AMS)
1,085
968
988
12.1
9.9
Microcontrollers and Digital ICs Group (MDG)
742
688
689
7.9
7.6
Others
3
3
4
—
—
Total consolidated net revenues
$2,754
$2,553
$2,648
7.9%
4.0%

text: On a sequential basis, ADG revenues were up 3.3%, driven by an increase in volumes of approximately 8%, partially offset by a decrease in average selling prices of approximately 5%, mostly attributable to product mix.
text: AMS revenues increased 12.1% driven by Analog and Imaging products. AMS increase was due to an increase of approximately 5% in average selling prices, entirely due to product mix, and to higher volumes of approximately of 7%.
text: MDG revenues increased by 7.9%, mainly driven by Microcontrollers, due to both higher average selling prices of approximately 6%, entirely due to product mix, and higher volumes of approximately 2%.
text: On a year-over-year basis, fourth quarter net revenues increased by 4.0%. ADG revenues decreased 4.5% compared to the year-ago quarter on lower revenues in both Automotive and Power Discrete. The decrease was entirely due to lower average selling prices of approximately 4%, while volumes remained substantially flat. The decrease in average selling prices was a combination of less favorable product mix and lower selling prices.
text: AMS fourth quarter revenues grew 9.9% year-over-year, mainly driven by Analog and Imaging. The increase was entirely due to higher average selling prices of approximately 18%, entirely attributable to product mix,
partially offset by lower volumes of approximately 8%. MDG fourth quarter revenues increased by 7.6%, mainly driven by Microcontrollers. The increase was due to higher average selling prices of approximately 9%,
entirely due to improved product mix.

Questions:
question: What led to increase in the revenue of ADG on sequential basis?
answer: driven by an increase in volumes of approximately 8%, partially offset by a decrease in average selling prices of approximately 5%, mostly attributable to product mix.
question: What led to increase in the revenue of AMS on sequential basis?
answer: driven by Analog and Imaging products. AMS increase was due to an increase of approximately 5% in average selling prices, entirely due to product mix, and to higher volumes of approximately of 7%.
question: What led to increase in the revenue of MDG on sequential basis?
answer: driven by Microcontrollers, due to both higher average selling prices of approximately 6%, entirely due to product mix, and higher volumes of approximately 2%.
question: What is the average net revenues from Automotive and Discrete Group (ADG) for the period December 31, 2019 and 2018?
answer: 945.5
derivation: (924+967) / 2
scale: million
question: What is the average net revenues from Analog, MEMS and Sensors Group (AMS) for the period December 31, 2019 and 2018?
answer: 1036.5
derivation: (1,085+988) / 2
scale: million
question: What is the average net revenues from Microcontrollers and Digital ICs Group (MDG) for the period December 31, 2019 and 2018?
answer: 715.5
derivation: (742+689) / 2 
scale: million