The phrase "a number of unpredictable" is correct and usable in written English.
It can be used when referring to multiple instances or occurrences that are not predictable or are subject to change.
Example: "There are a number of unpredictable factors that could affect the outcome of the experiment."
Alternatives: "several unpredictable" or "various unpredictable".
There are a number of unpredictable libertarian-leaning writers, including Conor Friedersdorf of The Atlantic on civil liberties issues, and Eugene Volokh on legal and free speech concerns.
A number of unpredictable environmental factors have to align for the plankton to be seen, so we were extremely lucky to see a magical light show that rivalled the brightness of the stars above.
The track itself is in line with the duo's existing material, kneading and slinging a host club-tangential sounds in a number of unpredictable directions at once.
Those errors can produce any number of unpredictable problems, at any time in life".
The path to successful pathogen genomic service delivery in the health system is likely to be interrupted by a number of potentially unpredictable step-changes in technological innovation and discovery.
Statistics dictate that the vastly greater number of transactions among computers in a world 100 times faster than today will lead to a greater number of unpredictable accidents, with less time in between them.
However, the relationship between the RSS values and the distance depends on a large number of unpredictable factors.
The Liberal party will likely only lose one seat to Labor in South Australia but the presence of the Nick Xenophon Team (NXT) has the potential to make a number of seats very unpredictable and could see the party win multiple seats in the House of Representatives and the Senate.
Speaking of transitions, John Oldenhof has found that the information and internal contacts he has acquired while fulfilling his duties as a clinical writer for a start-up medical biotech company have propelled his career in a number of fascinating (and unpredictable) directions.
It's easy to imagine how these instructions could evolve into a number of beautiful and unpredictable shapes.
The horse race for best musical between "Newsies," a high-energy show about 19th-century New York City newsboys, and "Once," a low-key story of unrequited love on the streets of Dublin, is only one of an unusually high number of unpredictable contests at the Tonys.
