Linux Bash generate a number of files of random sizes in a range

Linux Bash generate a number of files of random sizes in a range

#!/bin/bash
# generate a number of files with random sizes in a range
 
min=1      # min size (MB)
max=10     # max size (MB)
nofiles=20 # number of files
 
for i in `eval echo {1..$nofiles}`
do
    dd bs=1M count=$(($RANDOM%max + $min)) if=/dev/urandom of=./files/file$i
done

I think you have to change bs and count like this:
dd bs=$(($RANDOM%max + $min))M count=1 if=/dev/urandom of=./files/file$i