The weights of babies born at a certain large hospital are normally distributed with an average of 7.5 pounds and a standard deviation of 1.25 pounds.
What range of weights would put a baby born at this hospital in the middle 50%
in terms of weight?

Option E

Explanation:

Formula for the confidence interval here will be;

CI = x¯ ± zσ

Where;

x¯ is mean = 7.5 pounds

σ is standard deviation = 1.25

z is critical value at confidence interval of 50% = 0.674

Thus;

CI = 7.5 ± (0.674 × 1.25)

CI = (7.5 - (0.674 × 1.25)), (7.5 + (0.674 × 1.25))

CI ≈ (6.7, 8.3)

Thus,the range of weights is between 6.7 pounds and 8.3 pounds.

ek = (m·v2) / 2

v - velocity of system after the collision

m = m1 + m2

ek = (m1 + m2) ·v2/2

ek = (200 + 250) ·2,32/2 = 450·5,29/2 = 1190,25 j

false

explanation: