A Dell Business Notebook comes with a 130 watt power supply, although it only has one i5 cpu without another graphics card, why?

CPU: i5
Graphics card: integrated graphics card from the i5
HDD: 500 GB
Wireless Internet access
LAN
Sonic card slot for SIM card

Why a 130 watt power supply?
90 watts would be enough too?

That's why you do it so that the power supplies are not too warm. Such power supplies never consume 130 watts but only as much as just computing power is needed.

Maybe the laptop will load faster, also it would probably be too expensive for the countless laptop models they each have their own power supply to produce. Therefore, they will probably use power supplies with as many laptops as possible. Instead of e.g. To make extra 90 watt power supplies for this latpop and 130 watt power supplies, for the laptops that really need it, simply pack the 130 power supplies everywhere. This will probably make the whole logistics and organization so much easier that it saves more money than buying a cheaper, smaller power supply.

In addition, 130 watts is only the maximum, when the laptop is full and does not consume much power, it will not draw 130 watts from the socket, but only as much as necessary.

A few watts of reserve do not hurt. In addition, the notebook loads faster.