Answer:

And replacing we got:

And we can calculate this probabilit using the normal standard distribution or excel and we got:

Step-by-step explanation:
If we define the random variable of interest "the amount spent by a family of four of food per month" and we know the following parameter:

And we want to find the following probability:

And we can use the z score formula given by:

And replacing we got:

And we can calculate this probabilit using the normal standard distribution or excel and we got:

The exponent indicates how many times the base is used as a factor
He needs 2.5 lbs of sugar and 2.5 lbs of water
since 2.5 if 50% of 5 then thats how much sugar he needs.
Answer: 4
Step-by-step explanation: b=c2﹣a2=52﹣32=4