Among 157 African-American men, the mean systolic blood pressure was 146 mm Hg with a standard deviation of 27. We wish to know if on the basis of these data, we may conclude that
the mean systolic blood pressure for a population of African-American is greater than 140. Use
α=0.01.

Rob and amy each improved their yards by planting rose bushes and shrubs. they bought their supplies from the same store. rob spent $100 on 8 rose bushes and 5 shrubs. amy spent $112 on 8 rose bushes and 8 shrubs. what is the cost of one rose bush and the cost of one shrub? rose bush: $15,shrub: $5. rose bush: $10 , shrub: $4. rose bush: $7 , shrub: $5. rose bush: $13 , shrub: $2. pls will mark brainliest