You can use AnyDice, a dice statistic calculator
For your specific use-case, you would put in the script line
output 10d(1d10>6)
And click calculate.
The (1d10>6)
represents a single dice roll rolling higher than 6.
The 10d
before that repeats the process 10 times and aggregates it, giving a final result of how many times a number of more than 6 was rolled out of 10 dice.
To switch from the probability of exact values to cumulative values (ex. probability of having 1 to \$x\$ values of more than 6), go to the Data
control group and select At Least
This will give you the probability of getting 1 to \$x\$ rolls of 6 or more in your dice pool. As seen below, you have an 83.27% chance to have at least 3 dice with results of more than 6 in the pool.
Example AnyDice program used
Note: This tool is tailored for common dice expressions and has a few functions for less common dice processes found in more complex systems. It's not necessarily best suited for other statistical use.