Question

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Answer 1

Let assumed mean 'a' = 275

Class

intervalFrequency

fi

mid-point

(xi)

Deviation

di=xi−275

fidi150 - 20014175-100-1400200 - 25026225-50-1300250 - 3001727500300 - 350 23325501150350-400203751002000100450Hence by assumed mean method using formula 

xˉ=a+h1i=l∑5=275+1001×450

= 275 + 4.50  = 279.50

Explanation:

yes of course why not

Answer 2

Answer:

I hope it's help you

thank you