A student investigated the time taken for amylase to completely break down the starch in three different varieties of potato.

For each variety of potato, the student:

Added a uniform $cm31\text{ cm}^3$ cube of boiled potato to a test tube containing amylase solution.
Kept the mixture in a water bath at $37∘C37^\circ\text{C}$ .
Tested samples with iodine solution every 10 seconds to determine when all the starch had been digested.

The student repeated the test three times for each potato variety. The results are shown in the table below:

Variety of potato	Test 1 (s)	Test 2 (s)	Test 3 (s)	Mean (s)
Maris Piper	124	118	121	121
King Edward	142	148	145	145
Sweet Potato	188	196	192	Y

Calculate the value of Y in the table. Show your working.

A student investigated the time taken for amylase to completely break down the starch in three different varieties of potato.

For each variety of potato, the student:

Added a uniform $cm31\text{ cm}^3$ cube of boiled potato to a test tube containing amylase solution.
Kept the mixture in a water bath at $37∘C37^\circ\text{C}$ .
Tested samples with iodine solution every 10 seconds to determine when all the starch had been digested.

The student repeated the test three times for each potato variety. The results are shown in the table below:

Variety of potato	Test 1 (s)	Test 2 (s)	Test 3 (s)	Mean (s)
Maris Piper	124	118	121	121
King Edward	142	148	145	145
Sweet Potato	188	196	192	Y

Calculate the value of Y in the table. Show your working.

2 Organisation

2 Organisation Questions