Combine Queries – Randomise Results

Hi all, i’m at the very end of this little puzzle, but stuck at the last bit.

I have successfully combined my queries using the following code:

<?php $blogposts = get_posts(array(
   				'post_type' => 'post',
   				'posts_per_page' => 10
   		 		));	?>
   		<?php $people = get_posts(array(
   				'post_type' => 'people',
   				'posts_per_page' => 2,
   				'orderby' => 'rand'
   		 		));	?>
   		<?php $mergedposts = array_merge( $blogposts, $people );?>
   		<?php global $post;?>
   		<?php foreach( $mergedposts as $post )  {
   			setup_postdata($post);

the trouble is this displays the $blogposts, followed by the $people posts. I want it to take in all of the posts and spit them out randomly.

I’ve scoured all over but can’t figure this one out!

Any help is appreciated.

dan