I'm not able to get why 0.4 is used in finding miss rate of data cache rather than using 0.3 as it is also given that 30% of the instructions are data refernces. (https://i.sstatic.net/jJpC1.png)
The given fact is that there are 40 misses per thousand instructions for data cache. Data cache will only be accessed for Load/Store instructions. There are only 40% of Load/Store Instructions. Therefore in order to get the miss rate, you need to divide the value by 0.4.
