Solution :
Given :
Sample mean,
Sample size, n = 40
Standard deviation, s = 83.2
∴ The null hypothesis is
Alternate hypothesis is
Test statistic :
z = 0.813
Now at α = 0.05, for a right tailed,
Since, , we fail to reject the null hypothesis.
Answer:
f(3)=44
Step-by-step explanation:
-5(3)^2+(3)-2
-5(9)+3-2
-45+1
44
We open the brackets
And use the laws of indices
-2x^2(-5X^2+4X^3)
Opening brackets
10X^4-8X^5 we get X^4 and X^5 because the terms we have
multiplied have common bases and therefore we have added the powers
Hence our answer is 10X^4-8X^5
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