Two cars: probably 50 in one and 20 in the other.
iMac including internal/external peripherals: 10?
2 iDevices: 8 more (CPU, touch controller, GSM modules?)
My kitchen probably has 10-20 in various appliances.
Kids toys and video games: probably 40-50.
Cameras: 4-5
Almost every SD card has an ARM core, so 30 more there.
TV sets, Sat decoder, DVR: another 10?
I'd say 200 easily. I'd guess most households are somewhere around this number.
1 Intel i72700k desktop (4c),
1 Intel i72670qm HP laptop (4c),
1 Intel i3330m Acer laptop (2c),
1 AMD Phenom II x6 1100t desktop (6c),
1 AMD Phenom II x4 830 desktop (4c),
1 AMD C60 Acer laptop (2c),
1 Tegra II Viewsonic gtablet (1c),
1 Tegra II Droid X phone (1c),
and an ARM in the Raspberry Pi (1c).
Looks like I notch in at 25. I'm in a technology/business related research field.