Calculating probability of tye 1 error

Hi,

im new(Hi)

basically a question says

a sample of 36 parachutes were tested for quality control purpose and their opening altitude is recorded. a statician analysing the data wishes to test the null hypothesis http://thestudentroom.co.uk/latexren...a6a9c75db1.png against http://thestudentroom.co.uk/latexren...ea81d02ad1.png. He dicides on the following criteria:

Accept http://thestudentroom.co.uk/latexren...228769e82a.png if the sample mean is less than or equal to 210m

Reject http://thestudentroom.co.uk/latexren...228769e82a.png if the sample mean is more that 210m

(i) find the probability of making a type I error

can some one help me out please? i thought the prob of type I error was = significance level, but that doesn't seem to be given.

oh yh, mean is 200 and standard deviation is 30