Hey!

The book WBSCHE road to success mathematics, is indeed a good book for ISI B Stat admission test. These are some other books that you can use:

1. An Excursion in Mathematics
2. Problem Primer for the Olympiad
3. Modern Geometry
4. Plane Trigonometry

Hope this answer helps!

Hello,

There is a lot of examination which have the subject Bengali. So,  you need to mention the name of the proper examination. You please mention it in the comment section. After that I will be able to suggest you about the question.

Thank you.

Hello there!

Greetings!

To find  Inflection points you need to know that inflection points  are located one standard deviation above the mean and one standard deviation below the mean , so for any normal curve , you can easily find points of inflection , you  can find the x-values for the points of inflection  by subtracting the standard deviation from the mean and adding the standard deviation to the mean to get the two x values for the points of inflection.

thankyou