A manufacturer tests the lifespan of two different brands of light bulbs. The table below summarizes the results for a sample of each brand.
| Brand | Sample Size | Mean Lifespan (hours) | Standard Deviation (hours) |
|---|---|---|---|
| X | 5,000 | 1,000 | 50 |
| Y | 5,000 | 1,050 | 150 |
Which inference is best supported by the data in the table?
A higher proportion of Brand X bulbs have lifespans close to their mean than Brand Y bulbs.
Brand Y is guaranteed to have at least one bulb that lasts longer than any bulb from Brand X.
Brand X bulbs are generally less reliable but have a longer average lifespan than Brand Y.
The range of lifespans for Brand Y bulbs is smaller than for Brand X bulbs.
