Given an array of integers arr and two integers k and threshold, return the number of contiguous subarrays of size k whose average value is greater than or equal to threshold.

Constraints:

• $1 \leq$ arr.length $\leq 10^5$

• $1 \leq$ arr[i] $\leq 10^4$

• $1 \leq$ k $\leq$ arr.length

• $0 \leq$ threshold $\leq 10^4$

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